import sys

input = sys.stdin.readline


def main():
    A, B = map(int, input().split())
    if B % A == 0:
        print(A + B)
    else:
        print(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())
    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 input = sys.stdin.readline sys.stdin.readline input
import sys

input = sys.stdin.readline


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


if __name__ == '__main__':
    main()
