import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.DecimalFormat;
import java.text.ParseException;
 
public class InputHandler{
	public static void main(String[] args) {
	System.out.println("Reading from console.");
	double numberFromConsole; 
	try {
	InputStreamReader isr = new InputStreamReader(System.in);
	BufferedReader br = new BufferedReader(isr);
	String s = br.readLine();
	DecimalFormat df = new DecimalFormat();
	Number n = df.parse(s);
	numberFromConsole = n.doubleValue();
	} catch (IOException e) {		
                numberFromConsole = 0;
	} catch (ParseException e) {
		numberFromConsole = 0;
	}
    		System.out.println(numberFromConsole );
	}
}