import math

def cval(k):
    return k*(k+1)/2

n = int(input())
kmax = math.floor((math.sqrt(1+8*n)-1)/2)
cnum = 1
nremain = n - cval(kmax)
kval = kmax
while nremain > 0:
    if cval(kval) <= nremain:
        nremain -= cval(kval)
        cnum += 1
    else:
        kval -= 1

print(cnum)