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

m = []
for i in range(3):
    mtmp = [int(k) for k in input().strip().split(' ')]
    m.append(mtmp)

mindistance = 1000
for i in range(len(squares)):
    tsq = squares[i]
    distance = 0
    for j in range(3):
        for k in range(3):
            distance += abs(tsq[j][k] - m[j][k])
    if distance < mindistance:
        mindistance = distance

print (str(mindistance))