#include<iostream>
const long p = 3.14;
using namespace std;
int v = 0;
int main() {
	long h, r, v;
	cin >> h >> r;
	v = 20000/(p * r * r * h);
	if (v * h * r * r * 3.14 < 20000) v++;
	cout << v;
	return 0;
}