#include <iostream>
using namespace std;

int main()
{
    int h,r;
    cin >> h >> r;
    double s = 3.14*r*r;
    double v = s*h;
    long long a =20*1000;
    int ans=0;
    while(a>0)
    {
        ans++;
        a -= v;
    }
    cout << ans <<endl;
    return 0;
}