a=int(input())
x=1
if a==1:
    print('1')
    exit()
while(a!=1):
    if a%2==0:
        a=a/2
        x+=1
    else:
        a=a*3+1
        x+=1
print(x)

#python3

n=int(input())
while(1):
    if n<=10000:
        break
    else:
        n=int(input())
e=1
while(1):
    if n==1:
        break
    elif n%2!=0:
        n=3*n+1
        e=e+1
    elif n%2==0:
        n=n/2
        e=e+1
print(e)

#include<iostream>
using namespace std;
int main()
{
int n,a=0;
cin>>n;
while(n!=1)
{
if(n%2!=0) n=n*3+1;
else n=n/2;
a++;
}
cout<<a+1;
}

打表出奇迹

#include<iostream>
using namespace std;
const int p[]={0,1,2,8,3,6,9,17,4,20,7,15,10,10,18,18,5,13,21,21,8,8,16,16,11,24,11,112,19,19,19,107,6,27,14,14,22,22,22,35,9,110,9,30,17,17,17,105,12,25,25,25,12,12,113,113,20,33,20,33,20,20,108,108,7,28,28,28,15,15,15,103,23,116,23,15,23,23,36,36,10,23,111,111,10,10,31,31,18,31,18,93,18,18,106,106,13,119,26,26,26,26,26,88,13,39,13,101,114,114,114,70,21,13,34,34,21,21,34,34,21,96,21,47,109,109,109,47,8,122,29,29,29,29,29,42,16,91,16,42,16,16,104,104,24,117,117,117,24,24,16,16,24,37,24,86,37,37,37,55,11,99,24,24,112,112,112,68,11,50,11,125,32,32,32,81,19,32,32,32,19,19,94,94,19,45,19,45,107,107,107,45,14,120,120,120,27,27,27,120,27,19,27,40,27,27,89,89,14,40,40,40,14,14,102,102,115,27,115,53,115,115,71,71,22,53,14,14,35,35,35,128,22,84,22,128,35,35,35,53,22,22,97,97,22,22,48,48,110,48,110,66,110,110,48,48,9,123,123,123,30,30,30,79,30,123,30,22,30,30,43,43,17,30,92,92,17,17,43,43,17,43,17,61,105,105,105,43,25,30,118,118,118,118,118,56,25,74,25,118,17,17,17,43,25,38,38,38,25,25,87,87,38,131,38,38,38,38,56,56,12,25,100,100,25,25,25,144,113,51,113,25,113,113,69,69,12,113,51,51,12,12,126,126,33,126,33,126,33,33,82,82,20,126,33,33,33,33,33,51,20,46,20,46,95,95,95,46,20,20,46,46,20,20,46,46,108,64,108,59,108,108,46,46,15,33,121,121,121,121,121,121,28,59,28,77,28,28,121,121,28,20,20,20,28,28,41,41,28,41,28,134,90,90,90,134,15,134,41,41,41,41,41,33,15,59,15,54,103,103,103,41,116,28,28,28,116,116,54,54,116,28,116,54,72,72,72,98,23,116,54,54,15,15,15,41,36,129,36,129,36,36,129,129,23,36,85,85,23,23,129,129,36,36,36,28,36,36,54,54,23,49,23,23,98,98,98,142,23,49,23,142,49,49,49,98,111,23,49,49,111,111,67,67,111,62,111,36,49,49,49,62,10,36,124,124,124,124,124,62,31,124,31,124,31,31,80,80,31,31,124,124,31,31,23,23,31,23,31,49,44,44,44,137,18,44,31,31,93,93,93,44,18,137,18,31,44,44,44,88,18,44,44,44,18,18,62,62,106,57,106,31,106,106,44,44,26,31,31,31,119,119,119,31,119,57,119,119,119,119,57,57,26,75,75,75,26,26,119,119,18,57,18,70,18,18,44,44,26,132,39,39,39,39,39,70,26,132,26,132,88,88,88,132,39,26,132,132,39,39,39,39,39,31,39,31,57,57,57,132,13,52,26,26,101,101,101,39,26,145,26,101,26,26,145,145,114,52,52,52,114,114,26,26,114,52,114,145,70,70,70,96,13,65,114,114,52,52,52,65,13,65,13,39,127,127,127,39,34,127,127,127,34,34,127,127,34,127,34,65,83,83,83,171,21,34,127,127,34,34,34,65,34,26,34,26,34,34,52,52,21,47,47,47,21,21,47,47,96,34,96,140,96,96,47,47,21,140,21,21,47,47,47,96,21,91,21,47,47,47,47,140,109,21,65,65,109,109,60,60,109,34,109,153,47,47,47,60,16,34,34,34,122,122,122,153,122,34,122,60,122,122,122,122,29,122,60,60,29,29,78,78,29,78,29,104,122,122,122,73,29,60,21,21,21,21,21,73,29,47,29,135,42,42,42,135,29,42,42,42,29,29,135,135,91,135,91,42,91,91,135,135,16,29,135,135,42,42,42,86,42,42,42,42,42,42,34,34,16,60,60,60,16,16,55,55,104,29,104,148,104,104,42,42,117,148,29,29,29,29,29,179,117,148,117,29,55,55,55,148,117,117,29,29,117,117,55,55,73,148,73,47,73,73,99,99,24,68,117,117,55,55,55,117,16,68,16,55,16,16,42,42,37,130,130,130,37,37,130,130,37,130,37,68,130,130,130,117,24,130,37,37,86,86,86,130,24,174,24,86,130,130,130,37,37,37,37,37,37,37,29,29,37,29,37,29,55,55,55,130,24,50,50,50,24,24,24,143,99,50,99,37,99,99,143,143,24,99,50,50,24,24,143,143,50,24,50,37,50,50,99,99,112,94,24,24,50,50,50,50,112,143,112,42,68,68,68,94,112,112,63,63,112,112,37,37,50,156,50,63,50,50,63,63,11,37,37,37,125,125,125,37,125,156,125,125,125,125,63,63,32,125,125,125,32,32,125,125,32,63,32,94,81,81,81,169,32,81,32,32,125,125,125,76,32,76,32,63,24,24,24,169,32,24,24,24,32,32,50,50,45,138,45,138,45,45,138,138,19,45,45,45,32,32,32,76,94,138,94,32,94,94,45,45,19,94,138,138,19,19,32,32,45,138,45,94,45,45,89,89,19,45,45,45,45,45,45,138,19,37,19,37,63,63,63,63,107,19,58,58,107,107,32,32,107,151,107,58,45,45,45,58,27,151,32,32,32,32,32,58,120,182,120,151,120,120,32,32,120,58,58,58,120,120,120,120,120,32,120,58,58,58,58,89,27,151,76,76,76,76,76,50,27,102,27,120,120,120,120,71,19,58,58,58,19,19,71,71,19,58,19,71,45,45,45,164,27,133,133,133,40,40,40,133,40,133,40,133,40,40,71,71,27,133,133,133,27,27,133,133,89,40,89,71,89,89,133,133,40,177,27,27,133,133,133,89,40,40,40,84,40,40,40,177,40,40,32,32,40,40,32,32,58,32,58,84,58,58,133,133,14,53,53,53,27,27,27,146,102,146,102,53,102,102,40,40,27,102,146,146,27,27,102,102,27,53,27,177,146,146,146,102,115,27,53,53,53,53,53,146,115,102,115,53,27,27,27,53,115,53,53,53,115,115,146,146,71,45,71,27,71,71,97,97,14,115,66,66,115,115,115,159,53,40,53,115,53,53,66,66,14,53,66,66,14,14,40,40,128,40,128,115,128,128,40,40,35,159,128,128,128,128,128,97,35,66,35,66,128,128,128,115,35,35,128,128,35,35,66,66,84,97,84,128,84,84,172,172,22,84,35,35,128,128,128,35,35,79,35,128,35,35,66,66,35,27,27,27,35,35,27,27,35,27,35,79,53,53,53,128,22,141,48,48,48,48,48,53,22,141,22,141,48,48,48,141,97,35,35,35,97,97,141,141,97,35,97,141,48,48,48,172,22,97,141,141,22,22,22,97,48,35,48,141,48,48,97,97,22,48,92,92,22,22,48,48,48,48,48,48,48,48,141,141,110,40,22,22,66,66,66,92,110,66,110,141,61,61,61,154,110,110,35,35,110,110,154,154,48,61,48,61,48,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71,133,45,133,133,45,45,40,133,71,71,40,40,133,133,40,115,40,164,71,71,71,71,89,71,71,71,71,71,71,71,89,71,89,71,40,40,40,71,89,102,102,102,89,89,115,115,133,164,133,40,133,133,71,71,27,89,164,164,89,89,89,71,177,63,177,89,177,177,63,63,27,177,164,164,27,27,63,63,89,89,89,208,89,89,89,89,133,45,40,40,40,40,40,151,133,63,133,63,89,89,89,89,133,133,115,115,133,133,115,115,40,71,40,115,40,40,89,89,40,133,133,133,84,84,84,133,40,84,40,84,40,40,133,133,40,133,133,133,40,40,84,84,40,84,40,133,177,177,177,84,40,133,71,71,71,71,71,177,40,177,40,133,71,71,71,58,32,32,32,32,32,32,84,84,32,32,32,133,133,133,133,58,40,177,177,177,40,40,40,71,32,84,32,84,32,32,177,177,40,32,84,84,40,40,32,32,32,32,32,71,32,32,177,177,58,115,40,40,84,84,84,84,58,84,58,177,177,177,177,89,58,58,58,58,58,58,133,133,133,58,133,177,133,133,115,115,27,177,40,40,146,146,146,58,53,58,53,146,53,53,146,146,53,53,133,133,53,53,146,146,53,146,53,71,53,53,53,133,27,84,53,53,58,58,58,53,27,115,27,53,146,146,146,89,27,146,146,146,27,27,84,84,146,177,146,146,146,146,115,115,102,53,53,53,53,53,53,177,53,146,53,53,53,53,146,146,102,146,146,146,102,102,53,53,40,115,40,115,40,40,53,53,102,84,40,40,40,40,40,84,102,221,102,71,84,84,84,71,146,102,146,146,146,146,146,146,146,146,146,146,177,177,177,84,27,146,102,102,40,40,40,133,102,133,102,40,102,102,84,84,53,146,146,146,53,53,102,102,53,58,53,58,84,84,84,84,27,53,53,53,177,177,177,128,27,128,27,84,84,84,84,84,146,102,102,102,146,146,84,84,146,53,146,53,102,102,102,84,53,146,128,128,27,27,27,146,27,146,27,84,27,27,177,177,53,102,102,102,53,53,190,190,40,40,40,102,40,40,76,76,53,190,53,53,146,146,146,76,53,102,53,102,146,146,146,76,102,53,53,53,102,102,53,53,102,146,102,76,53,53,53,128,115,53,146,146,53,53,53,146,97,128,97,53,97,97,53,53,27,97,146,146,27,27,97,97,27,146,27,252,53,53,53,97,53,53,53,53,53,53,53,146,53,53,53,53,53,53,53,53,53,53,53,53,53,53,84,84,53,84,53,53,53,53,190,190,115,53,45,45,53,53,53,45,146,45,146,53,146,146,45,45,115,146,159,159,115,115,190,190,45,45,45,190,45,45,45,45,71,97,27,27,27,27,27,190,71,97,71,53,45,45,45,45,71,71,71,71,71,71,71,71,97,128,97,53,97,97,97,97,115,71,71,71,71,71,71,71,115,97,115,71,115,115,146,146,66,146,146,146,66,66,27,27,66,27,66,190,159,159,159,115,115,66,66,66,159,159,159,190,115,71,115,66,159,159,159,66,40,115,115,115,40,40,66,66,40,40,40,40,66,66,66,190,53,40,128,128,115,115,115,66,159,159,159,115,159,159,159,159,53,159,97,97,53,53,159,159,66,115,66,128,66,66,66,66,53,177,53,53,66,66,66,159,53,66,53,97,159,159,159,146,66,53,66,66,66,66,128,128,66,128,66,128,159,159,159,159,14,53,115,115,159,159,159,115,40,115,40,159,40,40,159,159,40,40,159,159,40,40,40,40,40,159,40,190,40,40,40,190,128,115,40,40,115,115,115,53,128,146,128,115,40,40,40,159,128,66,66,66,128,128,97,97,40,66,40,66,40,40,172,172,128,190,190,190,128,128,128,159,159,141,159,128,159,159,97,97,128,159,97,97,128,128,159,159,128,159,128,97,128,128,66,66,128,115,40,40,40,40,40,97,128,40,128,159,97,97,97,128,66,128,66,66,66,66,66,66,66,190,66,203,53,53,53,89,35,53,66,66,66,66,66,66,128,190,128,159,128,128,115,115,128,159,159,159,128,128,128,128,128,115,128,66,115,115,115,234,35,89,128,128,66,66,66,141,35,115,35,66,40,40,40,159,128,40,40,40,128,128,66,66,128,159,128,159,110,110,110,159,35,66,66,66,66,66,66,66,66,128,66,66,66,66,66,66,35,66,66,66,35,35,66,66,97,66,97,66,97,97,110,110,84,159,35,35,128,128,128,66,84,203,84,159,159,159,159,97,84,84,58,58,84,84,159,159,172,58,172,110,172,172,159,159,35,58,58,58,84,84,84,203,84,58,84,84,84,84,40,40,35,84,203,203,35,35,58,58,35,58,35,110,84,84,84,84,128,110,110,110,110,110,110,141,128,66,128,110,35,35,35,84,128,128,128,128,128,128,84,84,79,84,79,79,79,79,203,203,35,128,40,40,128,128,128,159,79,79,79,128,79,79,128,128,35,79,172,172,35,35,128,128,66,172,66,128,66,66,172,172,27,128,66,66,66,66,66,79,27,53,27,53,79,79,79,79,27,27,128,128,27,27,128,128,172,79,172,172,172,172,128,128,35,66,79,79,79,79,79,79,27,172,27,128,27,27,79,79,27,27,27,27,27,27,66,66,27,66,27,172,110,110,110,172,35,172,79,79,79,79,79,79,35,172,35,141,172,172,172,79,53,53,53,53,53,53,128,128,53,53,53,172,128,128,128,110,48,172,172,172,35,35,35,53,141,53,141,53,141,141,172,172,48,141,53,53,48,48,128,128,141,141,141,128,141,141,66,66,48,141,48,48,79,79,79,172,48,79,48,110,53,53,53,110,141,48,53,53,141,141,185,185,141,203,141,203,79,79,79,110,22,172,141,141,141,141,141,110,48,141,48,141,48,48,172,172,48,48,141,141,48,48,141,141,48,141,48,128,141,141,141,141,35,141,48,48,110,110,110,110,35,53,35,48,79,79,79,53,35,79,79,79,35,35,216,216,79,66,79,48,79,79,79,79,97,141,141,141,141,141,141,141,141,141,141,141,141,141,172,172,97,141,141,141,97,97,128,128,35,128,35,128,35,35,102,102,97,79,141,141,141,141,141,79,97,79,97,53,53,53,53,53,48,97,79,79,48,48,48,48,48,141,48,123,172,172,172,123,22,79,97,97,79,79,79,79,97,141,97,79,97,97,79,79,141,48,48,48,141,141,97,97,141,110,141,79,123,123,123,79,22,172,141,141,79,79,79,79,22,172,22,97,97,97,97,172,35,185,185,185,35,35,97,97,35,185,35,71,185,185,185,71,48,35,71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int main()
{
    int n;
    cin>>n;
    cout<<p[n];
    return 0;
}

p=int(input())
step=1
while p!=1:
if p%2 ==0:
p=p/2
step=step+1
else:
p=p*3+1
step=step+1
print(step)

a = int(input())
step = 0
while a!=1:
step += 1
if a%2==0:
a /= 2
else:
a = 3*a+1

print(step+1)

n = int(input())
m = 1
while n != 1:
    if n % 2 == 0:
        n = n / 2
        m += 1
    else:
        n = n * 3 + 1
        m += 1
print(m)

a=int(input())
x=1
if a==1:
print('1')
exit()
while(a!=1):
if a%2==0:
a=a/2
x+=1
else:
a=a*3+1
x+=1
print(x)

a=int(input())
x=1
if a==1:
print('1')
exit()
while(a!=1):
if a%2==0:
a=a/2
x+=1
else:
a=a*3+1
x+=1
print(x)

wszz=int(input())
cj=1

while(wszz!=1):
if(wszz%2==1):
wszz=wszz*3+1
else:
wszz=wszz/2
cj+=1
print(cj)

a=int(input())
times=1
while(a!=1):
if(a//2==a/2):
a=a/2
else:
a=a*3+1
times=times+1
print(times)

请忽略以下文字：
数据规模和约定
n<=10000
因为它也不会考比10000大的。

#include <stdio.h>
int main(int argc, char *argv[])
{
int i,count=1;
scanf("%d", &i);
while(i != 1)
{
count++;
if(i%2) i = i*3+1; //奇数 i=i*3+1
else i = i/2; //偶数 i=i/2
}
printf("%d\n",count);
return 0;
}