View Code of Problem 73

import java.util.Scanner;
 
 
 
public class Main {
	public static void main(String[] args)  {
		Scanner scanner = new Scanner(System.in);
		int x = scanner.nextInt();
		int sum=1;
		for(int i=x; i>1; i--) {
			sum = (sum+1)*2;
		}
		System.out.println(sum);
	}
 
 
}