#include<stdio.h>
#define Pi 3.14
int main() {
	int h, r, n;
	double v;
	scanf("%d %d", &h, &r);
	v = h * r * r * Pi;
	n = 20000 / v;
	if (20000 % (int)v == 0) {
		printf("%d", n);
	} 
	else {
		printf("%d", n + 1);
	}
	return 0;
}