def surfaceArea(H,W,A):
    #top & bottom view sides
    top_bot=2*H*W
    ans=0
		
    #row wise
    for row in A:
        ans+=row[0]+row[W-1] #right and left side of that row
        for i in range(W-1):
            ans+=abs(row[i]-row[i+1])
						
    #col wise
    ans+=sum(A[0])+sum(A[H-1]) #top row side and bottom row side
    for i in range(H-1):
        for j in range(W):
            ans+=abs(A[i][j]-A[i+1][j])
            
    return ans + top_bot