import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("请输入球的初始高度(m): ");
        double height = sc.nextDouble();

        // 初始化变量
        double currentHeight = height;
        double bounceHeight = height;
        int count = 0;

        while (currentHeight > 0) {
            // 记录弹跳次数
            count++;

            // 计算弹跳高度
            if (count == 1) {
                bounceHeight = height;
            } else {
                bounceHeight *= 0.95;
            }

            // 计算弹起后的高度
            currentHeight = currentHeight - bounceHeight * 2;

            // 如果球落地，则程序停止运行
            if (currentHeight <= 0) {
                break;
            }
        }

        System.out.println("球需要弹跳" + count + "次才能停止下落。");
    }
}