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

int main() {
    int n;
    scanf("%d", &n);
    int ans = -1001, sum = 0;
    for (int i = 1, x; i <= n; i++) {
        scanf("%d", &x);
        if (sum > 0) sum += x;
        else sum = x;
        ans = max(ans, sum);
    }
    printf("%d\n", ans);
    return 0;
}