题解 | #完全数计算#

# 20241011
def f(x):
    ls = []
    for i in range(1, x + 1):  # 注意求完全数时这个范围
        if x % i == 0:
            ls.append(i)
    # print(ls)
    del ls[-1]  # 删除自己
    # print(ls)
    if sum(ls) == x:
        return True
    return False


n = int(input())
c = 0
for i in range(1, n + 1):
    if f(i):
        c += 1
print(c)