import java.util.Scanner;

//题目：一球从100米高度*落下，每次落地后反跳回原高度的一半；再落下，求它在第10次落地时，共经过多少米？第10次反弹多高？

public class BallTest {

    public static void main(String[] args) {

        double firsthight;

        int n;

        Scanner in = new Scanner (System.in);//从键盘读取两个数据

        System.out.println("请输入从多少米落下：");

        firsthight = in.nextDouble();

        System.out.println("请输入第几次落下：");

        n = in.nextInt();

    System.out.println("从"+firsthight+"m"+"第"+n+"次落地经过的距离"+countTotalLong(n,firsthight)+"m");

    System.out.println("从"+firsthight+"m"+"第"+n+"次反弹高度"+countHeight(n,firsthight)+"m");

    }

    public static double countTotalLong(int n,double firsthight){//计算总的路径

        double totalLong =firsthight;

        for(int i = 0;i<n-1;i++){

            totalLong += firsthight/(double)(Math.pow(2,i));

        }

        return totalLong;

    }

    public static double countHeight(int n,double firsthight){ //计算每次反弹高度

        return firsthight/(double)(Math.pow(2,n));

    }

}