public class Main {
    public int solution(int n , int [][] arr){
        int answer = Integer.MIN_VALUE;
        int sum1 = 0;
        int sum2 = 0;
        int sum3 = 0;
        int sum4 = 0;


        for(int i=0, k = 4; i < n ; i++ , k--){
            sum3+=arr[i][i];      //대각선들의 합
            sum4+=arr[k][k];
            for(int j=0; j < n ; j++){
                sum1 += arr[i][j];      //행의 합
                sum2 += arr[j][i];      //열의 합
            }
            answer=Math.max(answer, sum1);
            answer=Math.max(answer, sum2);
            sum1 = 0;
            sum2 = 0;
        }

        answer=Math.max(answer, sum3);
        answer=Math.max(answer, sum4);


        return answer;
    }

    public static void main(String[] args) {
        Main t = new Main();
        Scanner scan = new Scanner(System.in);

        int n  = scan.nextInt();

        int [][] arr = new int[n][n];

        for(int i=0; i < arr.length ; i++){
            for(int j=0; j <arr[i].length; j++){
                arr[i][j] = scan.nextInt();
            }
        }

        System.out.println(t.solution(n,arr));
    }
}