def ABC_118_A():
    A,B = map(int, input().split())
    if B%A == 0:
        print(A+B)
    else:
        print(B-A)

if __name__ == '__main__':

    ABC_118_A() def ABC_118_A():
    A,B = map(int, input().split())
    if B%A == 0:
        print(A+B)
    else:
        print(B-A) ABC_118_A 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__':

    ABC_118_A() __name__ == '__main__' __name__ '__main__' ABC_118_A() ABC_118_A def ABC_118_A():
    A,B = map(int, input().split())
    if B%A == 0:
        print(A+B)
    else:
        print(B-A) def ABC_118_A():
    A,B = map(int, input().split())
    if B%A == 0:
        print(A+B)
    else:
        print(B-A) ABC_118_A
def ABC_118_A():
    A,B = map(int, input().split())
    if B%A == 0:
        print(A+B)
    else:
        print(B-A)

if __name__ == '__main__':

    ABC_118_A()