def main():
    n = int(input())
    i = 0
    l = [0] * 4472
    for i in range(4472):
        l[i] = (i + 1) * (i + 2) // 2
    ans = 0
    for i in l[::-1]:
        ans += n // i
        n %= i
    print(ans)


main()