import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = sc.nextInt();
		}
		sc.close();

		int mod = 998244353;
		Map<Integer, Long> map = new HashMap<>();
		map.put(0, 1L);
		for (int i = 0; i < n; i++) {
			Map<Integer, Long> wk = new HashMap<>();
			for (Integer k : map.keySet()) {
				int next = k + a[i];
				wk.put(next, wk.getOrDefault(next, 0L) + map.get(k));
				next = k - a[i];
				wk.put(next, wk.getOrDefault(next, 0L) + map.get(k));
			}
			map = wk;
		}
		long ans = 0;
		for (Integer k : map.keySet()) {
			long v = map.get(k) % mod;
			long val = Math.abs(k) * v % mod;
			ans += val;
		}
		ans %= mod;
		System.out.println(ans);
	}
}