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

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().rstrip() 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().rstrip() def input(): return sys.stdin.readline().rstrip() 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().rstrip()

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