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

matrix = [[], [], []]

for i in range(3):
    matrix[i] = [int(a) for a in input().split(' ')]

min_dist = None

for square in magic_squares:
    dist = 0
    for i in range(len(square)):
        for j in range(len(square[i])):
            dist += abs(square[i][j] - matrix[i][j])
    
    if min_dist is None or dist < min_dist:
        min_dist = dist

print(min_dist)