C++

#include<iostream>
using namespace std;
int main(){
int h, r;
cin >> h >> r;
double pi = 3.14159;
double a = pi * r * r * h;
double b = 20000/a;
if (b > (int)b) {
b = (int)b + 1;
} else {
b = (int)b;
}
printf("%.0f", b);

return 0;
}