def main():
    N = int(input())

    n = N
    num = 0
    while 1:
        i = coin(n)
        n -= i
        num += 1
        if not n:
            break
    print(num)

def coin(n):
    i = 1
    while 1:
        k = i * (i + 1) // 2
        if k > n:
            break
        else:
            x = k
        i += 1
    return x

main()