#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cmath>
#include <complex>
#include <deque>
#include <forward_list>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iostream>
#include <limits>
#include <list>
#include <map>
#include <memory>
#include <numeric>
#include <optional>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <tuple>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;
    long long sum = 0;
    vector<int> plus, minus;
    for (int i = 0; i < n; ++i)
    {
        int a;
        cin >> a;
        sum += a;
        if (a > 0)
        {
            plus.push_back(a);
        }
        else if (a < 0)
        {
            minus.push_back(a);
        }
    }
    sort(plus.begin(), plus.end(), greater<int>());
    sort(minus.begin(), minus.end());
    
    if (sum == 0){
        cout << "Yes" << endl;
    } else {
        if (sum > 0){
            if (sum - plus[0] <= 0){
                cout << "Yes" << endl;
            } else {
                cout << "No" << endl;
            }
        } else {
            if (sum - minus[0] >= 0){
                cout << "Yes" << endl;
            } else {
                cout << "No" << endl;
            }
        }
    }

}