A,B = map(int,input().split())

if(B%A == 0 and B/A > 0):
    print(A+B)
else:
    print(B-A) A,B = map(int,input().split()) A map(int,input().split()) map int input().split() ().split () input split B if(B%A == 0 and B/A > 0):
    print(A+B)
else:
    print(B-A) B%A == 0 and B/A > 0 B%A == 0 B%A B A 0 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
A,B = map(int,input().split())

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