#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main () {
	int N;
	cin >> N;
	std::vector<ll> A(N);
	for (auto& a : A) cin >> a;
	if (accumulate(A.begin(), A.end(), 0ll) < 0) {
		for (auto& a : A) a *= -1;
	}
	ll s = accumulate(A.begin(), A.end(), 0ll), m = *max_element(A.begin(), A.end());
	cout << (s <= m ? "Yes" : "No") << endl;
}