from bisect import bisect

N = int(input())
k = 1
L = []
x = 1
while x <= N:
    L.append(x)
    k += 1
    x = k * (k + 1) // 2
ans = 0
while N > 0:
    x = bisect(L, N)
    ans += 1
    N -= L[x - 1]
print(ans)