Problem:
Score : 100 points

Problem Statement

You are given positive integers A and B.

If A is a divisor of B, print A + B; otherwise, print B - A.

Constraints

All values in input are integers.

1 \leq A \leq B \leq 20

Input

Input is given from Standard Input in the following format:

A B

Output

If A is a divisor of B, print A + B; otherwise, print B - A.

Sample Input 1

4 12

Sample Output 1

16

As 4 is a divisor of 12, 4 + 12 = 16 should be printed.

Sample Input 2

8 20

Sample Output 2

12

Sample Input 3

1 1

Sample Output 3

2

1 is a divisor of 1.

Solution in Python (3.4.3) (judge verdict: Accepted)

#!/usr/bin/python

def main():
    A, B = [int(x) for x in input().split()]
    if divisor(A, B) == True:
        print(A + B)
    else:
        print(B - A)

def divisor(A, B):
    if B % A == 0: return True 
    return False


if __name__ == "__main__":
    main()