sqr1 = [[8,1,6],[3,5,7],[4,9,2]]
sqr11 = [[4,9,2],[3,5,7],[8,1,6]]

sqr2 = [[4,3,8],[9,5,1],[2,7,6]]
sqr22 = [[2,7,6],[9,5,1],[4,3,8]]

sqr3 = [[2,9,4],[7,5,3],[6,1,8]]
sqr33 = [[6,1,8],[7,5,3],[2,9,4]]

sqr4 = [[6,7,2],[1,5,9],[8,3,4]]
sqr44 = [[8,3,4],[1,5,9],[6,7,2]]

sqrs = [sqr1]+[sqr2]+[sqr3]+[sqr4]+[sqr11]+[sqr22]+[sqr33]+[sqr44]
line1 = map(int, raw_input().split())
line2 = map(int, raw_input().split())
line3 = map(int, raw_input().split())
##mat = [[4, 9, 2], [3, 5, 7], [8, 1, 5]]
mat = [line1]+[line2]+[line3]
def pprint(mat):
    for row in range(3):
        for col in range(2):
            print mat[row][col],
        print mat[row][2]

def diff(mat):
    bestdff = 100000
    bestmat = []
    for sqr in sqrs:
        dff = 0
        for row in range(3):
            for col in range(3):
                dff += abs(mat[row][col]-sqr[row][col])
        if dff < bestdff:
            bestdff = dff
            bestmat = sqr
    return(bestdff, bestmat)

print(diff(mat)[0])