def compare(sq1, sq2):
    result = 0
    for i in range(3):
        for j in range(3):
            result += abs(sq1[i][j] - sq2[i][j])
    return result

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

sq1 = [[int(i) for i in input().split()] for n in range(3)]

min_cost = 1000000
for sq2 in ms:
    cost = compare(sq1, sq2)
    if cost < min_cost:
        min_cost = cost
    if min_cost == 0:
        break
print(min_cost)