mss = [
    [[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]],
]

def diff(a, b, transposed=False):
    s = 0
    for i in range(3):
        for j in range(3):
            bi = b[j][i] if transposed else b[i][j]
            s += abs(a[i][j] - bi)
    return s

get_row = lambda: [int(n) for n in input().strip().split()]

m = []
for i in range(3):
    m.append(get_row())

minimum = 100

for ms in mss:
    d = diff(m, ms)
    minimum = min(minimum, d)

for ms in mss:
    d = diff(m, ms, transposed=True)
    minimum = min(minimum, d)

print(minimum)