#include<bits/stdc++.h>
using namespace std;
int main() {
	int h, r,v,temp, num = 0;
	cin >> h >> r;
	temp = 3.14 * r * r * h;
	v = 20000 % temp;
	if (v != 0) num = 20000 / temp + 1;
	else num = 20000 / temp;
	cout << num;
	return 0;
}