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 Julia (0.5.0) (judge verdict: Accepted)

if isfile("in.txt");mystdin=open("in.txt","r");redirect_stdin(mystdin);end
macro p(z);:((x->parse(Int,x)).(split($z)));end
function main()
  a,b=@p(readline())
  print(b%a==0 ? a+b : b-a)
end
main()
if isdefined(Base, :mystdin);close(mystdin);end