import sys
input = lambda: 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 input = lambda: sys.stdin.readline().rstrip() input lambda: sys.stdin.readline().rstrip() sys.stdin.readline().rstrip() sys.stdin.readline().rstrip sys.stdin.readline() sys.stdin.readline sys.stdin sys stdin readline rstrip 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 = lambda: sys.stdin.readline().rstrip() lambda: sys.stdin.readline().rstrip() input
import sys
input = lambda: 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()