View Code of Problem 73

#include <stdio.h>
#include <iostream>
#include <string.h>
#include <string>
#include <algorithm>
#include <iomanip>
#include<vector>
#include<math.h>
using namespace std;
int main()
{
	int n, m=1;
	cin >> n ;
	n = n - 1;
	while (n--) {
		m = (m + 1) * 2;
	}
	cout << m;
}