题解 | #牛牛的水杯#

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double PI = 3.14;
        int h = scanner.nextInt();
        int r = scanner.nextInt();
        //一杯水的体积
        double v = PI * h * r * r;
        //1立方厘米 == 1毫升 == 0.001升
        //10升 == 10000毫升
        if(10000 % v == 0) {
            System.out.println(10000 / (int)v);
        } else {
            System.out.println(10000 / (int)v + 1);
        }
    }
}