Title description:
Wukong picked a few peaches on the first day, and ate half of them immediately. It was not enough, so he ate one more, and there were still some leftovers the next day. He ate more than half of the peaches he laid, and he ate more than half of the remaining peaches from the previous day every day. When he was ready to eat on the nth day, only one peach was left. If you are smart, please help Wukong calculate how many peaches there were when he started eating on the first day?
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Input:
Enter a number n (1<=n<=30).
Output:
Output the number of peaches on the first day.
Sample input:
3
Sample output:
10
Program code:
import java.util.*;
public class Main
{
public static void main(String[] args)
{
Scanner input=new Scanner(System.in);
int n=input.nextInt();
int a=1;
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