# Enter your code here. Read input from STDIN. Print output to STDOUT
# Enter your code here. Read input from STDIN. Print output to STDOUT
magic1 = [[4,9,2],[3,5,7],[8,1,6]]
magic2 = [[2,7,6],[9,5,1],[4,3,8]]
magic3 = [[8,3,4],[1,5,9],[6,7,2]]
magic4 = [[6,1,8],[7,5,3],[2,9,4]]
magic5 = [[8,1,6],[3,5,7],[4,9,2]]
magic6 = [[4,3,8],[9,5,1],[2,7,6]]
magic7 = [[2,9,4],[7,5,3],[6,1,8]]
magic8 = [[6,7,2],[1,5,9],[8,3,4]]

def subtract(mat1,mat2):
    cost=0
    for i in range(3):
        for j in range(3):
            cost=cost+abs(mat1[i][j]-mat2[i][j])
    return cost
    
mat = []
mat.append(map(int,raw_input().split()))
mat.append(map(int,raw_input().split()))
mat.append(map(int,raw_input().split()))

test=[subtract(mat,magic1),subtract(mat,magic2),subtract(mat,magic3),subtract(mat,magic4),subtract(mat,magic5),subtract(mat,magic6),subtract(mat,magic7),subtract(mat,magic8)]
print min(test)