N = int(input())
cnt = [0] * (N+1)

i = 1
loop = 1
while i <= N:
    cnt[i] = 1
    for j in range(1, loop + 1):
        if i + j <= N:
            cnt[i + j] = cnt[j] + 1
    loop += 1
    i += loop

print(cnt[N])