d = 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991

len = d.to_s.length

N = gets.to_i

ans = (N * d).to_s

dif = ans.length - len

if dif == 0
  print "0"
end

0.upto(ans.length - 1) {|i|
  if (dif == i)
      print "."
  end
  print ans[i]
}
puts