#include <bits/stdc++.h>
#include <math.h>

using namespace std;

long long int sumOfGroup(long int k) {
    // Return the sum of the elements of the k'th group.
    long long int s=1;
    for(int i=0;i<3;i++)
    s*=k;
    return(s);
}

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