题解 | #完全数计算#

n = int(input())

def func(n):  # 实现因子函数
    nums = []
    for i in range(1,n):
        if n % i == 0:
            nums.append(i)
    return sum(nums)

counter = 0

for i in range(1,n + 1):  # 遍历1到n
    if func(i) == i:
        counter += 1

print(counter)