题解 | #牛牛的水杯#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Double h = sc.nextDouble();
        Double r = sc.nextDouble();
        System.out.printf("%.0f", Math.ceil(10000 / (3.14 * h * Math.pow(r, 2))));
    }
}