#include <bits/stdc++.h>

using namespace std;

long sumOfGroup(int k) {
    // Return the sum of the elements of the k'th group.
    int sum=((k*(k-1))+1);
    int t=sum;
    k=(k-1);
    while(k--)
    {
        sum=(sum+sum+2);
    }
    return (sum-t);
}

int main() {
    int k;
    cin >> k;
    long answer = sumOfGroup(k);
    cout << answer << endl;
    return 0;
}