#include <bits/stdc++.h>

using namespace std;

ifstream fin("ssm.in");
ofstream fout("ssm.out");
int n, i, a, sum, r;

int main() {
    fin >> n;
    for(i = 1; i <= n; i++) {
        fin >> a;
        sum = max(0, sum) + a;
        r = max(r, sum);
    }
    fout << r;

    return 0;
}