def solve():
    a, b = map(int, input().split())
    if b % a == 0:
        print(a+b)
    else:
        print(b-a)


if __name__ == '__main__':
    solve() def solve():
    a, b = map(int, input().split())
    if b % a == 0:
        print(a+b)
    else:
        print(b-a) solve 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)
    else:
        print(b-a) b % a == 0 b % a b a 0 print(a+b) print a+b a b print(b-a) print b-a b a if __name__ == '__main__':
    solve() __name__ == '__main__' __name__ '__main__' solve() solve def solve():
    a, b = map(int, input().split())
    if b % a == 0:
        print(a+b)
    else:
        print(b-a) def solve():
    a, b = map(int, input().split())
    if b % a == 0:
        print(a+b)
    else:
        print(b-a) solve
def solve():
    a, b = map(int, input().split())
    if b % a == 0:
        print(a+b)
    else:
        print(b-a)


if __name__ == '__main__':
    solve()
