a,b = map(int,input().split())
if b % a == 0:
    print(a + b)
elif b % a != 0:
    print(b - a) a,b = map(int,input().split()) a map(int,input().split()) map int input().split() ().split () input split b if b % a == 0:
    print(a + b)
elif b % a != 0:
    print(b - a) b % a == 0 b % a b a 0 print(a + b) print a + b a b elif b % a != 0:
    print(b - a) b % a != 0 b % a b a 0 print(b - a) print b - a b a b = map(int,input().split()) map(int,input().split()) b a,b = map(int,input().split()) map(int,input().split()) a
a,b = map(int,input().split())
if b % a == 0:
    print(a + b)
elif b % a != 0:
    print(b - a)