#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main() {
	int h, r, V;
	double n = 0;
	scanf("%d %d", &h, &r);
	V = (3.14 * r * r * h) * 1.0;
	n = 20000.0 / V;
	r = 20000 % V;
	if (r> 0)
		n++;
	printf("%.lf", n);

		return 0;
}