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

if A==1 and B==1:
    print(1)

elif A==B:
    print(0)
elif (A+B)%2==0:
    if 2*min(A,B)>=(A+B)//2:
        print(0)
    else:
        diff = abs(4 * min(A, B) - (A + B))
        print(diff)
else:
    if 2*min(A,B)>=(A+B-1)//2:
        
        print(1)
    else:
        diff = abs(4 * min(A, B) - (A + B))
        print(diff)