# -*- coding: utf-8 -*-
import math

#入力
#S = str(input())
#N, i = map(int, input().split())
#K = int(input())
A, B = map(int, input().split())

if B%A == 0 :
  print (A+B)
else :
  print (B-A) import math math 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 B = map(int, input().split()) map(int, input().split()) B
# -*- coding: utf-8 -*-
import math

#入力
#S = str(input())
#N, i = map(int, input().split())
#K = int(input())
A, B = map(int, input().split())

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