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import java.util.*;
import java.io.*;


public class Point2D {
	private Vector x = new Vector();
	private Vector y = new Vector();
	
	private InputStreamReader isr = new InputStreamReader(System.in);
	private BufferedReader br = new BufferedReader(isr);

	
	public void readIn()throws IOException

	{

			x.addElement(br.readLine());
			x.addElement(br.readLine());
			y.addElement(br.readLine());
			y.addElement(br.readLine());
		
	}
	public double distance(){
		Double x1, x2, y1, y2;
		
		Enumeration en = x.elements();		
		x1 = (Double) en.nextElement();
		x2 = (Double) en.nextElement();		
		en = y.elements();
		y1 = (Double) y.elementAt(0);
		y2 = (Double) y.elementAt(1);	
		
		double xx = x2.doubleValue() - x1.doubleValue();
		double yy = y2.doubleValue() - y1.doubleValue();
		

		double distance = Math.sqrt(Math.pow(xx, 2) + Math.pow(yy, 2));
		return distance;
		}
	
	
	public static void main(String arg[])throws IOException {
		Point2D p = new Point2D(); 
		System.out.println("Bitte geben Sie Ihre Punkte ein!");
		p.readIn();
		System.out.println(p.distance());
		
		
	}
	

} 

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Enumeration en = v.elements();
while (en.hasMoreElements()) {
String s = (String) en.getNextElement();
System.out.print(s);
}