Contest1212/A.cpp

//
// Created by liuhuan on 18-10-29.
//
#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    while(cin>>n){
        long long s=1;
        while(n>1){
            s=(s+1)*2;
            n--;
        }
        cout<<s<<endl;
    }
    return 0;
}