def compute_diff(square, etalon):
    res = 0
    for i in range(3):
        for ii in range(3):
            res += abs(square[i][ii] - etalon[i][ii])
    return res
square = [[int(x) for x in input().split()] for i in range(3)]
etalons = [[[8, 1, 6], [3, 5, 7], [4, 9, 2]], [[6, 1, 8], [7, 5, 3], [2, 9, 4]], [[8, 3, 4], [1, 5, 9], [6, 7, 2]], [[4, 3, 8], [9, 5 , 1], [2, 7, 6]], [[4, 9, 2], [3, 5, 7], [8, 1, 6]], [[2, 9, 4], [7, 5, 3], [6, 1, 8]], [[6, 7, 2], [1, 5, 9], [8, 3, 4]], [[2, 7, 6], [9, 5 , 1], [4, 3, 8]]]
min_dif = 9 * 10
for etalon in etalons:
    t = compute_diff(square, etalon)
    if t < min_dif:
        min_dif = t
print(min_dif)