import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner keyboard = new Scanner(System.in);

        double first_number;
        double second_number;
        double third_number;


        System.out.print( "What is your first number?" );
        first_number = keyboard.nextDouble();

        System.out.print( "What is your second number?"  );
        second_number = keyboard.nextDouble();

        System.out.print( "What is your third number?"  );
        third_number = keyboard.nextDouble();

        System.out.println("(" + first_number + "+" + second_number + "+" + third_number  + ")" + "/2");
        System.out.println("\nYour answer is " + ((first_number+second_number+third_number)/2));


    }
}