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 Perl (v5.18.2) (judge verdict: Accepted)


MAIN : {
	my $s1 = <STDIN>;
	chomp $s1;
	my ($a, $b) = split(" ", $s1);

	if ($b % $a == 0) {
		print STDOUT $a + $b, "\n";
	}
	else {
		print STDOUT $b - $a, "\n";
	}
}

__END__