#include <bits/stdc++.h>
using namespace std;
int ans, n, k, a[5000005], maxn;
int main()
{
  cin >> n;
  for (int i = 1; i <= n; i++)
  {
    cin >> a[i];
  }
  for (int i = 1; i <= n; i++)
  {
    ans += a[i];
    ans = max(0, ans);
    maxn = max(maxn, ans);
    // cout<<ans<<" ";
  }
  cout << maxn;
  return 0;
}