ACGO

#include <bits/stdc++.h>
using namespace std;
int num(int r,int h){
double sum= r * r* 3.14159 * h;
sum=20000/sum;
int m = ceil(sum);
cout<<m;
return 0;
}
int main(){
int r,h;
cin>>h>>r;
num(r,h);
return 0;
}