题解 | #完全数计算#

n = int(input())


def helper(x):
    res = []
    for j in range(1, x):
        if x % j == 0:
            res.append(j)
    if res:
        if sum(res) == x:
            return True
    else:
        return False


count = 0
for i in range(1, n + 1):
    if helper(i):
        count += 1

print(count)