public static int SearchArray(List<List<int>> arr)
{
    int maxY = arr.Count - 1;
    int maxX = arr[0].Count - 1;
      
    int maxCount = -63;
        
    for(int curY = 1; curY < maxY; curY++)
    {
        for(int curX = 1; curX < maxX; curX++)
        {
            int curCount = arr[curY-1].GetRange(curX-1, 3).Sum();
            curCount += arr[curY][curX];
            curCount += arr[curY+1].GetRange(curX-1, 3).Sum();
            
            maxCount = curCount > maxCount ? curCount : maxCount;
        }
    }
    
    return maxCount;
}