package Test_1;

import java.util.Scanner;

public class Test_10 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		float length = 100;
		System.out.print("请输入次数：");
		Scanner input = new Scanner(System.in);
		int num = input.nextInt();
		float s = 0;
		for(int i=1;i<=num;i++){
			s = s + length;
			length = length / 2;
		}
		System.out.println("落地"+num+"次后，小球经过的距离为："+s);
			
		
	}

}