a,b=map(int,input().split());print([a+b,b-a][b%a>0]) a,b=map(int,input().split()) a map(int,input().split()) map int input().split() ().split () input split b print([a+b,b-a][b%a>0]) print [a+b,b-a][b%a>0] [a+b,b-a] a+b a b b-a b a b%a>0 b%a b a 0 a,b=map(int,input().split()) map(int,input().split()) a b=map(int,input().split()) map(int,input().split()) b
a,b=map(int,input().split());print([a+b,b-a][b%a>0])