n = gets.to_i
D = "0.1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991"

amari = 0

(2...D.length).reverse_each do |i|
  cur_num = amari + n * D[i].to_i
  D[i] = (cur_num % 10).to_s
  amari = cur_num / 10
end
D[0] = amari.to_s if amari > 0

puts D