#include <bits/stdc++.h>
using namespace std;
int c = 1;
int f(int n)
{
	for (int i = 1;i < n;i++)
	{
		c = (c + 1) * 2;
	}
	return c;
}
int main()
{
	int n;
	cin >> n;
	cout << f(n)<< endl;
	return 0;
}