import sys
sys.setrecursionlimit(10**7)
input = sys.stdin.readline

a,b = map(int, input().split())

if b % a == 0:
    print(a + b)
else:
    print(b - a) import sys sys sys.setrecursionlimit(10**7) sys.setrecursionlimit sys setrecursionlimit 10**7 10 7 input = sys.stdin.readline input sys.stdin.readline sys.stdin sys stdin readline 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 a,b = map(int, input().split()) map(int, input().split()) a input = sys.stdin.readline sys.stdin.readline input b = map(int, input().split()) map(int, input().split()) b
import sys
sys.setrecursionlimit(10**7)
input = sys.stdin.readline

a,b = map(int, input().split())

if b % a == 0:
    print(a + b)
else:
    print(b - a)
