C语言程序设计教程（第三版）课后习题6.10 （Java代码）

import java.util.Scanner;

public class Main {

        public static void peach(int N){

                int num = 1;//桃子总数,桃子剩余数量

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

                        num=(num+1)*2;

                }

                System.out.print(num);

        }

        public static void main(String[] arg){

                Scanner sc = new Scanner(System.in);

                int N = sc.nextInt();

                peach(N);

        }

}