square = [[int(i) for i in input().split()] for i in range(3)]

square1 = [[4,9,2],[3,5,7],[8,1,6]]
square2 = [[2,9,4],[7,5,3],[6,1,8]]
square3 = [[8,3,4],[1,5,9],[6,7,2]]
square4 = [[6,1,8],[7,5,3],[2,9,4]]
square5 = [[2,7,6],[9,5,1],[4,3,8]]
square6 = [[4,3,8],[9,5,1],[2,7,6]]
square7 = [[8,1,6],[3,5,7],[4,9,2]]
square8 = [[6,7,2],[1,5,9],[8,3,4]]

squares = [square1,square2,square3,square4,square5,square6,square7,square8]

mindiff = 1000
for i in squares:
    diff = 0
    for j in range(3):
        for k in range(3):
            diff += abs(square[j][k] - i[j][k])
    if mindiff > diff:
        mindiff = diff
print(mindiff)