题解 | #完全数计算#

num = int(input())
def isperfect(num):
    perfect_list = []
    for i in range(1,num):
        if num % i == 0:
            perfect_list.append(i)
    if sum(perfect_list) == num:
        return True
    else:
        return False
count = 0
for i in range(1,num+1):
    count += isperfect(i)
print(count)