import java.util.Scanner;


public class Esercizio1 {
 public static void main(String[] args) {
	 int[] V;
	 int y=0;
	 int somma=0;

	 Scanner input = new Scanner(System.in);
	 System.out.print("dim");
	 int dim=input.nextInt();
	 V= new int[dim];
	 for(int i=1; i<dim; i++) {
		 System.out.print("V["+i+"]=");
		 V[i]=input.nextInt();
		 if(V[i]%2==0) {
			 somma+=V[i];
			 y++;
		 }

	 }

	 System.out.println(somma/y);
 }
}