import sys

sys.setrecursionlimit(10 ** 6)
def II(): return int(sys.stdin.readline())

def main():
    n=II()
    max_k=int(-1+(1+8*n)**0.5)//2+1
    ans=0
    for k in range(max_k,0,-1):
        coin=k*(k+1)//2
        cnt,n=divmod(n,coin)
        ans+=cnt
    print(ans)

main()