题解 | #完全数计算#

n = int(input())
index = 0
ss =[]

for i in range(1,n+1):
    ss = []
    total = 0
    for j in range(1,i,1):
        if i % j == 0:
            ss.append(j)
    for k in ss:
        total += k
    if total == i:
        index += 1

print(index)