import sys

input = sys.stdin.readline


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


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

input = sys.stdin.readline


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


if __name__ == "__main__":
    main()
