#include <iomanip>

#include <iostream>

using namespace std;

int main()
{

double h, r, v;

int n;

cin>>h>>r;

v=r*r*3.1415926*h;

n=int(20000/v);

if (20000/v>0)
{

n++;

cout<< n;

}else {

cout<< n;

}

return 0;

}

#include<iostream>
#include<cmath>
using namespace std;
const double PI=3.14159;
int main(){
int h,r;
cin >> h >> r;
cout<<ceil(20/(PI*r*r*h/1000));
return 0;
}

#include <iomanip>
#include <iostream>
using namespace std;
int main()
{
double h, r, v;
int n;
cin>>h>>r;
v=r*r*3.1415926*h;
n=int(20000/v);
if (20000/v>0)
{
n++;
cout<< n;
}else
{
cout<< n;
}
return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
int h,r,sum;
double pi=3.14159,v,ml;
cin>>h>>r;
v=pi*r*r*h;
ml=v;
sum=ceil(20000/ml);
cout<<sum;
return 0;
}

#include<bits/stdc++.h>
#define db double
using namespace std;
int main()
{
const double Pi=3.14159;
int a,h,r;
cin>>h>>r;
int cnt=0;
int sum=0;
while(sum<=20000)
{
sum+=Pi*r*r*h;
cnt++;
}
printf("%d",cnt);
return 0;
}

#include<bits/stdc++.h>
#define db double
using namespace std;
const db pi=3.14159;
int main(){
db h,r;cin>>h>>r;
int cnt=0;
db sum=0;
while(sum<=20000){
sum+=pi*r*r*h;
cnt++;
}
printf("%d",cnt);
return 0;
}

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int h,r;
cin>>h>>r;
cout<<ceil(20*1000/(3.14159*r*r*h))<<endl;
return 0;
}

#include<bits/stdc++.h>
#define db double
using namespace std;
const db pi=3.14159;
int main(){
    db h,r;cin>>h>>r;
    int cnt=0;
    db sum=0;
    while(sum<=20000){
        sum+=pi*r*r*h;
        cnt++;
    }
    printf("%d",cnt);
    return 0;
}