#include <bits/stdc++.h>
using namespace std;
int main()
{
    int h,r;
    cin >> h >> r;
    double v = 3.14159 * (r * r * h) / 1000; //这里是ml / 1000 ==》 l
    double count = 0;
    int t = 0;
    if ( v >= 20 ) {
        cout << 1;
        return 0;
    }
    while ( count < 20 ) {
        count = count + v;
        t++;
    }
    cout << t;
    return 0;
}