def hourglassSum(arr):
    # Write your code here
    addn=[] 
    for i in range(4): 
        for j in range(4): 
            top=arr[i][j]+arr[i][j+1]+arr[i][j+2] 
            middle=arr[i+1][j+1] 
            bottom=arr[i+2][j]+arr[i+2][j+1]+arr[i+2][j+2] 
            add=top+bottom+middle 
            addn.append(add)
    return max(addn)