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])