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

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

a = []
for _ in range(3):
    a.append(map(int, raw_input().strip().split(" ")) )

m = float("inf")
for test in arr:
    cost = 0
    for i in range(3):
        for j in range(3):
            cost += abs(test[i][j]-a[i][j])
    m = min(m,cost)
    test = map(list, zip(*test))
    cost = 0
    for i in range(3):
        for j in range(3):
            cost += abs(test[i][j]-a[i][j])
    m = min(m,cost)
print m