View Code of Problem 73

#include<iostream>
#include<algorithm>
#include<math.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<cstring>
#include<string>
using namespace std;
int main() {
    int n,sum=1;
    cin>>n;
    for(int i=1;i<n;i++)
    {
    	sum=(sum+1)*2;
	}
	cout<<sum;
	return 0;
}