#include "bits/stdc++.h"
using namespace std;

#define REP(i, n) for(int i=0; i<(n); i++)

int N;
int maxhp(vector<int> D, int hp, int ceilhp) {
    if (D.empty()) return hp;
    int mh = 0;
    REP(i,D.size()) {
        int h = min(hp + D[i], ceilhp);
        if (h <= 0) continue; // 死亡
        vector<int> tmp;
        for (int j : D) tmp.push_back(j);
        tmp.erase(tmp.begin() + i);
        mh = max(mh, maxhp(tmp, h, ceilhp + ((D[i]<0)?100:0)));
    }
    return mh;
}
signed main()
{
    cin >> N;
    vector<int> D(N);
    REP(i,N) cin >> D[i];
    cout << maxhp(D, 100, 100) << endl;
    return 0;
}