import sys
def input(): return sys.stdin.readline().strip()


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 def input(): return sys.stdin.readline().strip() input 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 input(): return sys.stdin.readline().strip() def input(): return sys.stdin.readline().strip() input 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
import sys
def input(): return sys.stdin.readline().strip()


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

if __name__ == "__main__":
    main()
