jie

#include <iostream>
using namespace std;
int h, r;
int Up(double num) {
int intNum = static_cast<int>(num);
if (intNum < num) {
return intNum + 1;
} else {
return intNum;
}
}

int main() {

cin >> h >> r;
cout << Up(20000 / (r * r * 3.14159 * h));

}