A

#include<bits/stdc++.h>
using namespace std;
long long dp[100005];
int main()
{
    int n;cin >> n;
    dp[1] = 0; dp[2] = 4;
    for(int i  =3;i <= n;i++)
    {
        dp[i] = dp[i-1]*2;
    }
    cout << dp[n]+1;
}