题解 | #牛牛的水杯#

import java.util.Scanner;
// ceil函数向上取整
public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        double h = sc.nextDouble();
        double r = sc.nextDouble();
        
        int result = (int)Math.ceil(10000 / (3.14 * h * r * r));
        System.out.println(result);
    }
}