a,b =map(int,input().split())
if int(b/a) == b/a:
    print(a+b)
else:
    print(b-a) a,b =map(int,input().split()) a map(int,input().split()) map int input().split() ().split () input split b if int(b/a) == b/a:
    print(a+b)
else:
    print(b-a) int(b/a) == b/a int(b/a) int b/a b a b/a b a print(a+b) print a+b a b print(b-a) print b-a b a 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())
if int(b/a) == b/a:
    print(a+b)
else:
    print(b-a)