import sys,math,collections;sys.setrecursionlimit(10**7)
from operator import itemgetter
def Is(): return [int(x) for x in sys.stdin.readline().split()]
def Ss(): return sys.stdin.readline().split()
def I(): return int(sys.stdin.readline())
def S(): return input()

def tri(n):
    return (math.sqrt(1+8*n)-1)//2

n = I()
ans = 0
while n:
    t = tri(n)
    ans += 1
    n -= (t*(t+1))/2
print(ans)