#include <bits/stdc++.h>
#define endl '\n'
using namespace std;

int n;
int arr[100100];

int main(){
	cin >> n;
	long long cnt = 1;
	
	for(int i = 1; i <= n; i++){
		cnt = cnt * 2;
	}
	
	cout << cnt - 1;
	return 0;
}