# Enter your code here. Read input from STDIN. Print output to STDOUT

def calc_cost(m, s):
    ret = 0
    for i in range(3):
        for j in range(3):
            if m[i][j] != s[i][j]:
                ret += abs(m[i][j] - s[i][j])
    return ret
        
s = []
for i in range(3):
    s.append([int(x) for x in raw_input().split(' ')])
mat = [
[[2,7,6],[9,5,1],[4,3,8]],
[[2,9,4],[7,5,3],[6,1,8]],
[[4,3,8],[9,5,1],[2,7,6]],
[[4,9,2],[3,5,7],[8,1,6]],
[[6,7,2],[1,5,9],[8,3,4]],
[[6,1,8],[7,5,3],[2,9,4]],
[[8,3,4],[1,5,9],[6,7,2]],
[[8,1,6],[3,5,7],[4,9,2]]]
diffs = []
for i in range(8):
    diffs.append(calc_cost(mat[i], s))
print min(diffs)