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)
p /= g
q /= g
puts (0...n).count {
  x, y = read_line.split.map(&.to_i64)
  x % g == p % g && y % g == q % g
}