题解 | #求小球落地5次后所经历的路程和第5次反弹的高度#

import java.util.Scanner;

// 等差通项公式是啥来着
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int start = in.nextInt();
            double dis = start * (1d + 1d + 1d/2d + 1d/4d + 1d/8d);
            double fifth = start * 1d / 16d / 2d;
            System.out.println(dis);
            System.out.println(fifth);
        }
    }
}