A, B = [int(i) for i in input().split()]

if B % A == 0:
    print(A + B)
else:
    print(B - A) int(i) for i in input().split() for i in input().split() i input().split() ().split () input split for i in input().split() int(i) int i A, B = [int(i) for i in input().split()] A [int(i) for i in 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 B = [int(i) for i in input().split()] [int(i) for i in input().split()] B A, B = [int(i) for i in input().split()] [int(i) for i in input().split()] A
A, B = [int(i) for i in input().split()]

if B % A == 0:
    print(A + B)
else:
    print(B - A)