lib C
  fun strtoll(s : UInt8*, p : UInt8**, b : Int32) : Int64
end

class String
  def to_i64
    C.strtoll(self, nil, 10)
  end
end

p, q = read_line.split.map(&.to_i64)
n = read_line.to_i
g = p.gcd(q)
if g > 0
  p //= g
  q //= g
end
puts (0...n).count {
  x, y = read_line.split.map(&.to_i64)
  if g == 0
    {x, y} == {0, 0}
  elsif (p + q).even?
    {x % g, y % g} == {0, 0} && (x // g + y // g).even?
  else
    {x % g, y % g} == {0, 0}
  end
}