import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

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

        int N = Integer.parseInt(sc.next());
        List<Integer> cards = new ArrayList<>();
        for (int i = 0; i < N; i++) {
            cards.add(Integer.parseInt(sc.next()));
        }

        int sum = cards.get(0);
        if (cards.get(0) < 0 && cards.get(1) >= 0) sum = -sum;
        for (int i = 1; i < N; i++) {
            if (cards.get(i) < 0) {
                if (sum < 0) {
                    sum *= cards.get(i);
                    continue;
                } else {
                    sum -= cards.get(i);
                    continue;
                }
            }
            if (cards.get(i) == 1) {
                sum += cards.get(i);
                continue;
            }
            if (cards.get(i) > 0) {
                sum *= cards.get(i);
            }
        }
        System.out.println(sum);
    }
}