#include<bits/stdc++.h>

using namespace std;

int PI = 3.14;
int h, r, sum;
double s;

int main(){
    cin >> h >> r;
    s = PI * r * r;
    s *= h;
    sum = 20000 / s;
    s -= sum;
    s == 0 ? cout << sum : cout << sum + 1;
    return 0;
}