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

                              Online C++ Compiler.
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*******************************************************************************/

#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 = INT_MIN;

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;
}