#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;

}