#include <bits/stdc++.h>

using namespace std;

int main() {
    int h, r;
    cin >> h >> r;
    double v;
    v = h * 3.14 * r * r;
    int n;
    n = (20000 % int(v) != 0 ? 20000 / int(v) + 1 : 20000 / int(v));
    cout << n << endl;
}