def main():
    a, b = map(int, input().split())

    if b % a == 0:
        print(a + b)
    else:
        print(b - a)


if __name__ == "__main__":
    main() def main():
    a, b = map(int, input().split())

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

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

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

    if b % a == 0:
        print(a + b)
    else:
        print(b - a)


if __name__ == "__main__":
    main()
