#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
   ll n;
   cin>>n;
   ll arr[n];
   ll sum=0, maxsum=-100000000;
   ll rez=-10000000;
   for(int i=0; i<n;i++){
       cin>>arr[i];
   }
   for(int i=0;i<n;i++){
       sum+=arr[i];
       maxsum=max(maxsum+arr[i], arr[i]);
    if(maxsum>rez){
        rez=maxsum;
    }
   }
   cout<<rez;



 return 0;
}