#include<iostream>
using namespace std;
double pi=3.14159;
int main(){
	int r,h,v,ans;
	cin>>h>>r;
	v=pi*r*r*h;
	if(20000%(int)v!=0)
		ans=20000/(int)v+1;
	else
		ans=20000/(int)v;
	cout<<ans;
	return 0;
}