#!/bin/python3

import sys

def sumOfGroup(k):
    # Return the sum of the elements of the k'th group.
    s = 0
    if(k%2 != 0):
        s = ((int(k/2)+1)*((k*k)-1))+((int(k/2)+1)*((k*k)+1))-(k*k)
    else:
        s = k**3
    return s

if __name__ == "__main__":
    k = int(input().strip())
    answer = sumOfGroup(k)
    print(answer)