A, B = gets.split.map(&:to_i)

all = 1
same = 1
(0 ... 31).each do |bit|
    case [A[bit], B[bit]]
    when [0, 1]
        all *= 2
        same = 0
    when [1, 0]
        all = same = 0
    end
end

puts (all + same) / 2