n = io.read("*n")
if(n < 1000) then print(n * 1.08)
else
  n = n * 108
  s = string.format("%d", n)
  len = string.len(s)
  for i = 1, len do
    if(i == len - 1) then io.write(".") end
    io.write(string.sub(s, i, i))
  end
  io.write("\n")
end