import math, cmath

mod107 = 1000000007;
mod998 = 998244353;
alphabet = 'abcdefghijklmnopqrstuvwxyz'

def pyth(a, b, c, d):
    l = ((a - c) ** 2 + (b - d) ** 2) ** 0.5
    return l

#-------------------------
n = int(input())
ans = 0

for i in range(n):
    ans += (i + 1) ** (i % 3 + 1)

print(ans)