Sum of DivisorsEasy

Sum of Divisors

EasyPractice library · +10 XPmathnumber theory

Given a positive integer N, compute the sum of all its positive divisors, including 1 and N itself. For example, the divisors of 6 are 1, 2, 3, and 6. Their sum is 1 + 2 + 3 + 6 = 12.

Input

A single line containing a positive integer N.

Output

A single line containing the sum of all positive divisors of N.

Constraints

1 <= N <= 1000

Time limit 1 s (native code; slower languages get more)Memory 256 MB12 hidden tests

Example 1

Input
6
Output
12

The divisors of 6 are 1, 2, 3, and 6. The sum is 1 + 2 + 3 + 6 = 12.

Example 2

Input
10
Output
18

The divisors of 10 are 1, 2, 5, and 10. The sum is 1 + 2 + 5 + 10 = 18.

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