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

square = []

for _ in range(3):
    square.append([int(num) for num in raw_input().split()])
# square.reverse()

solutions = []

solutions.append([[4, 9, 2], [3, 5, 7], [8, 1, 6]])
solutions.append([[8, 1, 6], [3, 5, 7], [4, 9, 2]])
solutions.append([[2, 9, 4], [7, 5, 3], [6, 1, 8]])
solutions.append([[6, 1, 8], [7, 5, 3], [2, 9, 4]])
solutions.append([[2, 7, 6], [9, 5, 1], [4, 3, 8]])
solutions.append([[4, 3, 8], [9, 5, 1], [2, 7, 6]])
solutions.append([[6, 7, 2], [1, 5, 9], [8, 3, 4]])
solutions.append([[8, 3, 4], [1, 5, 9], [6, 7, 2]])

min_diff = 1000

for solution in solutions:
    diff = 0
    for row in range(3):
        for column in range(3):
            diff += abs(solution[row][column] - square[row][column])
    if diff < min_diff:
        min_diff = diff

print min_diff