Оператори и Изрази 6

import org.omg.Messaging.SYNC_WITH_TRANSPORT;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner=new Scanner (System.in);


           Double a=Double.parseDouble(scanner.nextLine());
           Double b=Double.parseDouble(scanner.nextLine());
        Double h=Double.parseDouble(scanner.nextLine());


           double square=(a+b)/2*h;

        System.out.println(square);

    }
}