row1 = list(map(int, list(input().split(' '))))
row2 = list(map(int, list(input().split(' '))))
row3 = list(map(int, list(input().split(' '))))


squares = [[[4, 9, 2],
            [3, 5, 7],
            [8, 1, 6]],

           [[2, 7, 6],
            [9, 5, 1],
            [4, 3, 8]],

           [[6, 1, 8],
            [7, 5, 3],
            [2, 9, 4]],

           [[8, 3, 4],
            [1, 5, 9],
            [6, 7, 2]],

           [[2, 9, 4],
            [7, 5, 3],
            [6, 1, 8]],

           [[6, 7, 2],
            [1, 5, 9],
            [8, 3, 4]],

           [[8, 1, 6],
            [3, 5, 7],
            [4, 9, 2]],

           [[4, 3, 8],
            [9, 5, 1],
            [2, 7, 6]]]

def cost(magic, input):
    cost = 0
    for i in range(3):
        for j in range(3):
            cost += abs(magic[i][j] - input[i][j])
    return cost


def it(s):
    return [cost(squares[i], s) for i in range(len(squares))]

print(min(it([row1, row2, row3])))