abc

#include <iostream>
#include <vector>
using namespace std;

int main()
{
   int N, a;
   int m = 0;
   vector<int> array;
   cin >> N;
   for (int i=0; i< N; i++){
       cin >> a;
       array.push_back(a);
   }
   a = 0;
   for (int i=0; i< N-4; i++){
     for (int j=i; j<i+5; j++){
         a+= array[j];
     }
     if (a > m){
     m =a;
     }
     a = 0;
   }
   cout << m;
    return 0;
}