#include <iostream>
using namespace std;
int main(){
//Input Array
int n;
cin >> n;
int arr[n];
for(int i =0;i< n;i++){
cin >> arr[i];
}
int currentSum = 0;
int maxSum = INT_MIN;
//algo
for (int i = 0; i < n; i++)
{
currentSum += arr[i];
if (currentSum <0)
{
currentSum = 0;
}
maxSum = max(maxSum, currentSum);
}
cout << maxSum << endl;
return 0;
}