public class Solution {
    private static void prettyPrint(List<List<Integer>> arr, int xOffset, int yOffset, int size) {
        for (int x=0; x<size; x++) {
            for (int y=0; y<size; y++) {
                System.out.print(arr.get(x + xOffset).get(y + yOffset) + " ");
            }
            System.out.println();
        }
    }
    
    private static int[][] hourglass = { {1, 1, 1},
                                         {0, 1, 0},
                                         {1, 1, 1} };
    
    private static int sumHourglass(List<List<Integer>> arr, int xOffset, int yOffset) {
        int sum = 0;
        for (int x=0; x<3; x++) {
            for (int y=0; y<3; y++) {
                if (hourglass[x][y]==1) {
                    sum += arr.get(x + xOffset).get(y + yOffset);
                }
            }
        }
        
        return sum;
    }
    
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

        List<List<Integer>> arr = new ArrayList<>();

        final int n = 6;
        IntStream.range(0, n).forEach(i -> {
            try {
                arr.add(
                    Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
                        .map(Integer::parseInt)
                        .collect(toList())
                );
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        });

        bufferedReader.close();
        
        int max = Integer.MIN_VALUE;
        for (int x=0; x<=n-3; x++) {
            for (int y=0; y<=n-3; y++) {
//                prettyPrint(arr, x, y, 3);
                final int sum = sumHourglass(arr, x, y);
//                System.out.println(sum);
                if (sum>max) max = sum;
            }
        }
        
        System.out.println(max);

    }
}