#include <cstdio>
using namespace std;

int h, r;
double sum;

int main()
{
    scanf("%d%d", &h, &r);
    sum = 1.0 * h * r * r * 3.14;
	sum = 20000.0 / sum;
    if (int(sum) != sum)
    {
        sum = int(sum) + 1;
    }
    printf("%.0lf", sum);
    return 0;
}