import java.io.*;

public class Leer
{
    public static String dato ()
    {
        String x = "";
        try
        {
            InputStreamReader isr = new InputStreamReader (System.in);
            BufferedReader in = new BufferedReader (isr);
            x = in.readLine ();
        }
        catch (IOException e)
        {
            System.err.print ("Error: " + e.getMessage ());
        }
        return x;
    }


    public static int datoInt ()
    {
        try
        {
            return Integer.parseInt (dato ());
        }
        catch (NumberFormatException e)
        {
            return 0;
        }
    }


    public static float datoLong ()
    {
        try
        {
            return Long.parseLong (dato ());
        }
        catch (NumberFormatException e)
        {
            return 0l;
        }
    }


    public static float datoFloat ()
    {
        try
        {
            return (new Float (dato ())).floatValue ();
        }
        catch (Exception e)
        {
            return Float.NaN;
        }
    }


    public static double datoDouble ()
    {
        try
        {
            return (new Double (dato ())).doubleValue ();
        }
        catch (Exception e)
        {
            return Double.NaN;
        }
    }
}