View Code of Problem 73

#include<stdio.h>
#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
#include<vector>
#include<cmath>
#include<stack>
#include<map>
#include<vector>
#include<cstdbool>
using namespace std;


int main()
{
	int n;
	cin >> n;
	int sum = 1;
	for (int i = n; i > 1; i--) {
		sum = (sum + 1) * 2;
	}
	cout << sum << endl;

	return 0;
}