s = []

for i in range(3):
    s.append(list(map(int, input().split())))
    
min_cost = 1000
    
magic_squares = {1: [[2, 7, 6], [9, 5, 1], [4, 3, 8]],
                 2: [[4, 3, 8], [9, 5, 1], [2, 7, 6]],
                 3: [[4, 9, 2], [3, 5, 7], [8, 1, 6]],
                 4: [[8, 1, 6], [3, 5, 7], [4, 9, 2]],
                 5: [[8, 3, 4], [1, 5, 9], [6, 7, 2]],
                 6: [[6, 7, 2], [1, 5, 9], [8, 3, 4]],
                 7: [[6, 1, 8], [7, 5, 3], [2, 9, 4]],
                 8: [[2, 9, 4], [7, 5, 3], [6, 1, 8]]}

for n in range(1, 9):
    cost = 0
    ms = magic_squares[n]
    
    cost = sum(abs(s[i][j] - ms[i][j]) for i in range(3) for j in range(3))
    min_cost = min(cost, min_cost)

print(min_cost)