#include <bits/stdc++.h>

using namespace std;

long sumOfGroup(int k) {
    long i = (long) k;
    long res = i*i*i;
    return res;
    // Return the sum of the elements of the k'th group.
}

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