import sys
from itertools import takewhile, count

sys.setrecursionlimit(10**7)

n = int(input())
koukas = [
    k * (k + 1) // 2 for k in takewhile(lambda k: k * (k + 1) // 2 <= n, count(1))
]


def can(m, n):
    if m == 0 or n == 0:
        return m == n

    for kouka in koukas:
        if kouka > n:
            break
        if can(m - 1, n - kouka):
            return True

    return False


for m in count(1):
    if can(m, n):
        print(m)
        exit()