# -*- coding: utf-8 -*-
import sys
from bisect import bisect_left

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 from bisect import bisect_left 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
# -*- coding: utf-8 -*-
import sys
from bisect import bisect_left

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