#include<iostream>
#include<cstdio>
#include<string>
#include<cstring>
#include<cmath>
using namespace std;

int main()
{
	long  long n,h,v,r;
	cin>>h>>r;
	v=r*r*3.14*h;
	if(double(20000%v)!=0) cout<<20000/v+1;
	else cout<<20000/v; 



return 0;
}