def Sum(n):
    s = 0
    for i in range(1,n):
        if n%i==0:
            s += i
    return s

def IsPerfect(n):
    return n == Sum(n)

n = int(input("enter n:"))
for i in range(1,n+1):
    if IsPerfect(i)==True:
       print(i)