from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    N = int(input())

    ans = 0
    for t in range(21):
        for g in range(t + 1):
            n = t * 5 + g * 2
            if n <= N and not (N - n) % 3:
                ans += 1
    print(ans)


main()