sqrs = [[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]]

inp = [int(i) for i in (input().split() + input().split() + input().split())]
m = -1
for s in sqrs:
    r = sum([abs(i - j) for i, j in zip(inp, s)])
    if r < m or m == -1:
        m = r

print(m)