import java.util.Scanner;

public class Tri {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		System.out.print("Dolzina polja: ");
		int d = sc.nextInt();
		int polje[] = new int[d];
		for(int i = 0; i < d; i++){
			polje[i] = sc.nextInt();
		}
		int liha =0, soda = 1;
		for(int i = 0; i < d; i++){
			if(polje[i] % 2 == 1){
				liha += polje[i];
			}
			else{
				soda *= polje[i];
			}
		}
		System.out.println("Rezultat: " + (liha - soda));
	}

}