# frozen_string_literal: true

class Integer
  def solve
    n = self - 9
    data = DATA.map { _1[0..-3].strip[0..-3] }
    n >= 13 ? data[13] : data[n]
  end
end

puts gets.to_i.solve

__END__
(%i9) for i: 10 step 1 thru 30 do print(bfzeta(i, 8));            
1.0009946b0 
1.0004942b0 
1.0002461b0 
1.0001227b0 
1.0000613b0 
1.0000306b0 
1.0000153b0 
1.0000076b0 
1.0000038b0 
1.0000019b0 
1.000001b0 
1.0000005b0 
1.0000002b0 
1.0000001b0 
1.0000001b0 
1.0b0 
1.0b0 
1.0b0 
1.0b0 
1.0b0 
1.0b0 
(%o9)                                done