这里的PI我用了前80位的

# include <bits/stdc++.h>

using namespace std;
const double PI=3.141592653589793238462643383279502884197169399375105820979230781640628620899;
int main(){
	int h,r,d,ans;
	cin>>h>>r;
	d=r*r*PI*h;
	ans=20*1000/d;
	cout<<ans+1<<endl;
	return 0;
}