r1 = input().split()
r2 = input().split()
r3 = input().split()
calc = [[int(i) for i in r1], [int(i) for i in r2], [int(i) for i in r3]]
l1 = [[8, 1, 6], [3, 5, 7], [4, 9, 2]]
l2 = [[4, 9, 2], [3, 5, 7], [8, 1, 6]]
l3 = [[8, 3, 4], [1, 5, 9], [6, 7, 2]]
l4 = [[6, 7, 2], [1, 5, 9], [8, 3, 4]]
l5 = [[2, 7, 6], [9, 5, 1], [4, 3, 8]]
l6 = [[2, 9, 4], [7, 5, 3], [6, 1, 8]]
l7 = [[6, 1, 8], [7, 5, 3], [2, 9, 4]]
l8 = [[4, 3, 8], [9, 5, 1], [2, 7, 6]]


def main(l):
    diff = 0
    for i in range(0, 3):
        for j in range(0, 3):
            diff += abs(calc[i][j] - l[i][j])
    return diff


print(min(main(l1), main(l2), main(l3), main(l4), main(l5), main(l6), main(l7), main(l8)))