#include <iostream>
using namespace std;
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
int n, mx;
cin >> n;
int arr[n];
int sum[n];
for (int i = 0; i < n; i++)
{
cin >> arr[i];
if (i > 0 && sum[i - 1] + arr[i] > arr[i])
sum[i] = sum[i - 1] + arr[i];
else
sum[i] = arr[i];
}
mx = sum[0];
for (int i = 1; i < n; i++)
{
if (mx < sum[i])
mx = sum[i];
}
cout << mx;
}