import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        PriorityQueue<Integer> queue = new PriorityQueue<>();
        for (int i = 0; i < n; i++) {
            queue.add(sc.nextInt());
        }
        int sum = 0;
        while (queue.size() > 1) {
            sum += queue.poll() / 2;
        }
        sum += queue.poll();
        System.out.println(sum);
    }
}