题解 | #完全数计算#

def f(x):# 判断x是不是完美数
    ls = []
    for i in range(1,x+1):
        if x%i == 0 and i != x:
            ls.append(i)
   # print(ls)
    sum_x = sum(ls)
    #print(sum_x)
    if sum_x == x:
        return True
    else:
        return False
       
n = int(input())
c = 0
for j in range(1,n+1):
    if f(j):
        c+=1
print(c)