#include<iostream>
#include<vector>
using namespace std;
int main(){
    int x;
    while (cin >> x){
        vector<int> v(x);
        int s;
        for (int i = 0; i < x; ++i) cin >> s;
        bool trobat = false;
        if (x == 0){
            trobat = true;
            cout << "NO" << endl;
        }
        for (int i = 0; i < x && !trobat; ++i){
             int suma = 0;
             for (int j = 0; j < x; ++j){
                 if (j != i) suma += v[j];
             }
             if (v[i] == suma){
                 trobat = true;
                 cout << "SI" << endl;
             }
        }
        if (!trobat) cout << "NO" << endl;
    }
}