#include<iostream>
using namespace std;
int main()
{
int x,cnt=0;
cin >> x;
while(x!=1)
{
if(x%2==0)
{
x=x/2;

}
else{
x=3*x+1;
}
cnt++;
}
cout<<cnt<<endl;
return 0;
}/

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,cnt=0;
    scanf("%d",&n);
    while(n!=1)
    {
        if(n%2==0)
            n/=2;
        else
            n=3*n+1;
        cnt++;
    }
    printf("%d",cnt);
    return 0;
}

#include <cstdio>
int main(){
    int x;
    scanf("%d",&x);
    int res=0;
    while (x!=1){
        if (x&1) x=(3*x+1)>>1,res+=2;
        else x>>=1,++res;
    }
    printf("%d\n",res);
}