class XORShift
  def initialize(x)
    @x = x
    @y = 1
    @z = 2
    @w = 3
  end

  def generate
    t = (@x ^ (@x << 11))
    @x, @y, @z = @y, @z, @w
    @w = (@w ^ (@w >> 19)) ^ (t ^ (t >> 8))
  end
end

seed = gets.to_i
a = 1000001
puts (2000000000..2300000000).bsearch { |x|
  xor = XORShift.new(seed)
  (1..a).count { xor.generate <= x } >= (a / 2 + 1)
}