/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <iostream>
#include <limits.h>
using namespace std;

long long n, arr[1000000];

int main()
{


    cin >> n;
    for(int i=0; i<n; i++){
        cin >> arr[i] ;
    }

long long sum = arr[0];
long long maxSoFar = arr[0];

for(int i=1; i<n; i++){

sum = sum + arr[i];



if (sum > maxSoFar) {
    maxSoFar = sum;
}


if (sum < 0) sum = 0;
}

cout << maxSoFar;

    return 0;
}