// This program reads a speed and then outputs the Fujita details
// Barry Cornelius, 24th November 1999
import java.io. BufferedReader;
import java.io. InputStreamReader;
import java.io. IOException;
public class Fujita
{
   public static void main(final String[] args) throws IOException
   {
      final BufferedReader tKeyboard =
                    new BufferedReader(new InputStreamReader(System.in));
      System.out.print("Type in the speed: ");
      String tLine = tKeyboard.readLine();
      final double tSpeed = Double.parseDouble(tLine);
      if (tSpeed<40.0)
      {
         System.out.println("this speed is too small for the Fujita scale");
      }
      else if (tSpeed<72.5)
      {
         System.out.println("F0 light");
      }
      else if (tSpeed<112.5)
      {
         System.out.println("F1 moderate");
      }
      else if (tSpeed<157.5)
      {
         System.out.println("F2 considerable");
      }
      else if (tSpeed<206.5)
      {
         System.out.println("F3 severe");
      }
      else if (tSpeed<260.5)
      {
         System.out.println("F4 devastating");
      }
      else if (tSpeed<318.5)
      {
         System.out.println("F5 incredible");
      }
      else
      {
         System.out.println("this speed is too large for the Fujita scale");
      }
  }
}