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

squares = []
for arr in [list(map(int, input().split(" "))) for x in range(3)]:
    for item in arr:
        squares.append(item)


def diff(my_arr, magic):
    my_diff = 0
    for idx, val in enumerate(my_arr):
        my_diff += abs(val - magic[idx])
    return my_diff


def min_diff():
    diffs = []
    for i in range(0, 8):
        diffs.append(diff(squares, magic_squares[i]))
    return min(diffs)

print(min_diff())