def perfectnum(num):
    divsum = 0
    for i in range(1,num):
        if num % i ==0:
            divsum = divsum + i #divsum += i
    if divsum == num:
        print("Perfect Number......")
    else:
        print("Not a Perfect number.")

n = int(input("Enter the Postive number :- "))
perfectnum(n)