小狗给的

#include <iostream>
#include <cmath>
using namespace std;

int num(int r, int h) {
double sum = r * r * M_PI * h;
int m = ceil(20000 / sum);
return m;
}

int main() {
int r, h;
cin >> h >> r;
cout << num(r, h) << endl;
return 0;
}