#include <stdio.h>

int main() {
    int h, r = 0;
    int count = 0;
    float sum = 0;
    scanf("%d %d", &h, &r);
    float volume = 0;
    volume = 3.14 * h * r * r / 1000;
    while (sum < 10) {
        sum += volume;
        count++;//喝的杯数加1
    }
    printf("%d", count);
    return 0;
}