import java.util.Scanner;
public class triCalc {

public static void main(String args) {

Scanner scan=new Scanner(System.in);

double Ax, Ay, Bx, By , Cx , Cy;


Ax = scan.nextDouble();
Ay = scan.nextDouble();

Bx = scan.nextDouble();
By = scan.nextDouble();

Cx = scan.nextDouble();
Cy = scan.nextDouble();



double BC_x_CENTER=(Bx+Cx)/2 , BC_y_CENTER=(By+Cy)/2,
AB_x_CENTER=(Ax+Bx)/2 , AB_y_CENTER=(Ay+By)/2,
AC_x_CENTER=(Ax+Cx)/2 , AC_y_CENTER=(Ay+Cy)/2;

double Ox=(BC_x_CENTER+Ax)*2/3 , Oy=(BC_y_CENTER+Ay)*2/3;

System.out.println("check: AB(" + AB_x_CENTER + "," + AB_y_CENTER + ")");