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

bits_a = []
bits_b = []

A.to_s(2).rjust(32, '0').reverse.each_char.with_index do |ch, idx|
  next if ch == '0'

  bits_a << idx
end

B.to_s(2).rjust(32, '0').reverse.each_char.with_index do |ch, idx|
  next if ch == '0'

  bits_b << idx
end

a = (bits_a & bits_b).size
b = bits_b.size - a
c = (bits_a - bits_b).size

# p [:bits_a, bits_a]
# p [:bits_b, bits_b]
# p [:a, a, :b, b, :c, c]

if c > 0
  puts 0
elsif b == 0
  puts 1
else
  puts (2 ** b) / 2
end