# 3k-2: 1+4+7+...+(3k-2)
# 3k-1: 2^2+5^2+8^2+...+(3k-1)^2
# 3k : 3^3+6^3+9^3+...+(3k)^3
N = int(input())
k = N//3
ans = 0
ans += (k * (3 * k - 1))/2
ans += (6 * k ** 3 + 3 * k**2 - k)/2
ans += (3**3) * ((k*(k+1))/2)**2
if N%3==1:
    ans += 3*k+1
elif N%3==2:
    ans += 3*k+1 + (3*k+2)**2
print(int(ans))
"🐬🍫🎵"