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
ctmp = 10**100 - 1
kval = kmax
nremain = n - cval(kmax)
while nremain > 0:
    if cval(kval) <= nremain and ctmp > 0:
        nremain -= cval(kval)
        cnum += 1
        ctmp -= 1
    else:
        kval -= 1
        ctmp = 10**100

print(cnum)