A,B = map(int, input().split())
if A==B==1:
    print(2)
    exit()
A,B = max(A,B),min(A,B)
same = A-B
not_same = A+B-same
for i in range(B):
    if same<not_same:
        same+=1
        not_same-=1
print(abs(same-not_same))