import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(br.readLine());
		String[] sa = br.readLine().split(" ");
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sa[i]);
		}
		br.close();

		List<Integer> lm = new ArrayList<>();
		List<Integer> lp = new ArrayList<>();
		long sum = 0;
		for (int i = 0; i < n; i++) {
			if (a[i] < 0) {
				lm.add(-a[i]);
			} else {
				lp.add(a[i]);
			}
			sum += a[i];
		}
		Collections.sort(lm);
		Collections.sort(lp);

		if (sum < 0) {
			sum += lm.get(lm.size() - 1);
			if (sum >= 0) {
				System.out.println("Yes");
			} else {
				System.out.println("No");
			}
		} else {
			sum -= lp.get(lp.size() - 1);
			if (sum <= 0) {
				System.out.println("Yes");
			} else {
				System.out.println("No");
			}
		}
	}
}