Can someone help me with this code?

I'm making a program to find the distance between two points.

Code:

`import cs1.Keyboard;`

import java.text.NumberFormat;

import static java.lang.Math.*;

public class Distance

{

public static void main (String[] args)

{

System.out.println ("Enter the first x coordinate: ");

double x1 = Keyboard.readInt();

System.out.println ("Enter the first y coordinate: ");

double y1 = Keyboard.readInt();

System.out.println ("Enter the second x coordinate: ");

double x2 = Keyboard.readInt();

System.out.println ("Enter the second y coordinate: ");

double y2 = Keyboard.readInt();

double distance = sqrt((x1-x2)(x1-x2) + (y1-y2)(y1-y2));

System.out.println ("The distance is:" + distance);

}

}

I keep getting the error message:

unexpected type. At the sqrt line.

And I use BlueJ

Please helppp! :)