题解 | #完全数计算#

n = int(input())

if n <= 2:
    print(0)
else:
    r = 0
    for i in range(3, n):
        k = [1]
        for j in range(2, i):
            if not i % j:
                k.append(j)
        if sum(k) == i:
            r += 1
    print(r)