#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;
}