# Enter your code here. Read input from STDIN. Print output to STDOUT
arr =[]
mag = [0,0,0,0,0,0,0,0,0,0]
m1 = [[8,1,6],[3,5,7],[4,9,2]]
m2 = [[8,3,4],[1,5,9],[6,7,2]]
m3 = [[4,3,8],[9,5,1],[2,7,6]]
m4 = [[4,9,2],[3,5,7],[8,1,6]]
m5 = [[2,9,4],[7,5,3],[6,1,8]]
m6 = [[2,7,6],[9,5,1],[4,3,8]]
m7 = [[6,7,2],[1,5,9],[8,3,4]]
m8 = [[6,1,8],[7,5,3],[2,9,4]]
cost = 100;
c1 = c2 =c3 =c4 =c5 =c6 =c7 =c8 =0
for i in range(0,3):
    arr.append(map(int, raw_input().split()))
for i in range(0,3):
    for j in range(0,3): 
        c1 += abs(arr[i][j] - m1[i][j])
        c2 += abs(arr[i][j] - m2[i][j])
        c3 += abs(arr[i][j] - m3[i][j])
        c4 += abs(arr[i][j] - m4[i][j])
        c5 += abs(arr[i][j] - m5[i][j])
        c6 += abs(arr[i][j] - m6[i][j])
        c7 += abs(arr[i][j] - m7[i][j])
        c8 += abs(arr[i][j] - m8[i][j])
    
cost = min(cost,min(c1,min(c2,min(c3,min(c4,min(c5,min(c6,min(c7,c8))))))))    
print cost