题解 | #牛牛的水杯#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int h = in.nextInt();
        int r = in.nextInt();
        final double pi=3.14;
        double m =(10000/(pi*h*r*r));
        int n = m==Math.floor(m) ? (int)m:(int)(m+1);
        System.out.printf("%d",n);
    }
}