m = int(input())
count = 0
for i in range(2, m):
    j = 1
    for k in range(2, int(i**(1/2) + 1), 1):
        if i % k == 0:
            # 一次找出俩因子
            if i // k == k:
                j += k
            else:
                j += k + i // k
    if i == j:
        count += 1
print(count)