Find the sum of the divisors of N Write a program that displays on the screen the sum of the divisors of a number (1 ≤ N ≤ 100) entered by the user in the range of 1 to N.

This is OEIS A000203.



Examples:

Input: 7

7 / 1 = 7
7 / 7 = 1

7 + 1 = 8


Output: 8



Input: 15

15 / 1 = 15
15 / 3 = 5
15 / 5 = 3
15 / 15 = 1

15 + 5 + 3 + 1 = 24


Output: 24



Input: 20

20 / 1 = 20
20 / 2 = 10
20 / 4 = 5
20 / 5 = 4
20 / 10 = 2
20 / 20 = 1

20 + 10 + 5 + 4 + 2 + 1 = 42


Output: 42



Input: 1

1 / 1 = 1


Output: 1



Input: 5

5 / 1 = 5
5 / 5 = 1

5 + 1 = 6


Output: 6
05AB1E, 2 bytes
ÑO

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Ñ    Divisors
 O   Sum