import java.io.*;

public class Tastatur
{
	private BufferedReader ind;

	public Tastatur()
	{
		ind = new BufferedReader(new InputStreamReader(System.in));
	}

	public String lęsLinie()
	{
		try {
			String linie = ind.readLine();
			return linie;
		} catch (IOException u)
		{
			u.printStackTrace();
		}
		return null;
	}

	public double lęsTal()
	{
		String linie = lęsLinie();
		return Double.parseDouble(linie);
	}
}