# Enter your code here. Read input from STDIN. Print output to STDOUT
magic_squares = [[[8, 1, 6],
                  [3, 5, 7],
                  [4, 9, 2]],
                 [[4, 3, 8],
                  [9, 5, 1],
                  [2, 7, 6]],
                 [[2, 9, 4],
                  [7, 5, 3],
                  [6, 1, 8]],
                 [[6, 7, 2],
                  [1, 5, 9],
                  [8, 3, 4]],
                 [[6, 1, 8],
                  [7, 5, 3],
                  [2, 9, 4]],
                 [[8, 3, 4],
                  [1, 5, 9],
                  [6, 7, 2]],
                 [[8, 3, 4],
                  [1, 5, 9],
                  [6, 7, 2]],
                 [[4, 9, 2],
                  [3, 5, 7],
                  [8, 1, 6]],
                 [[2, 7, 6],
                  [9, 5, 1],
                  [4, 3, 8]]]

input_square = [[int(elem) for elem in raw_input().split(' ')] for i in range(3)]
min_cost = float('inf')

for magic_square in magic_squares:
    cost = 0
    
    for i in range(3):
        for j in range(3):
            cost += abs(input_square[i][j] - magic_square[i][j])
            
    if cost < min_cost:
        min_cost = cost

print min_cost