function main() {

    let arr = Array(6);

    for (let i = 0; i < 6; i++) {
        arr[i] = readLine().replace(/\s+$/g, '').split(' ').map(arrTemp => parseInt(arrTemp, 10));
    }
    
    console.log(maxHourglassSum(arr));
}

function maxHourglassSum(arr) {
    const rows = arr.length;
    const cols = arr[0].length;

    // Handle cases where the array is smaller than 3x3
    if (rows < 3 || cols < 3) return null;

    let maxSum = -Infinity; // Initialize to the smallest possible value

    // Loop through the top-left corners of the possible hourglasses
    for (let i = 0; i <= rows - 3; i++) {
        for (let j = 0; j <= cols - 3; j++) {
            // Calculate the hourglass sum
            let sum = arr[i][j] + arr[i][j + 1] + arr[i][j + 2] // Top row
                    + arr[i + 1][j + 1]                         // Middle element
                    + arr[i + 2][j] + arr[i + 2][j + 1] + arr[i + 2][j + 2]; // Bottom row

            // Update maxSum if the current hourglass sum is greater
            if (sum > maxSum) {
                maxSum = sum;
            }
        }
    }

    return maxSum;
}