include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin >> n;
int ans = 0;
int maxn = -1e9;
for (int i = 1; i <= n; i++) {
int k;
cin >> k;
ans += k;
if (ans < 0) {
ans = 0;
}
maxn = max(ans, maxn);
}
cout << maxn;
return 0;
}