# Enter your code here. Read input from STDIN. Print output to STDOUT
row1 = map(int, raw_input().split(' '))
row2 = map(int, raw_input().split(' '))
row3 = map(int, raw_input().split(' '))

answer = 9999
matrix = [row1[0],row1[1],row1[2],
          row2[0],row2[1],row2[2],
          row3[0],row3[1],row3[2]]

combos = ['816357492', '618753294',
          '492357816', '294753618',
          '834159672', '438951276',
          '672159834', '276951438']

for c in combos:
    t = map(int, c)
    result = 0
    for i in range(9):
        #print "result=>%d ... matrix[i]=>%d ... t[i]=>%d" % (result, matrix[i], t[i])
        result = result + abs(matrix[i] - t[i])
    #print "-----> %d" % (result)
    
    if result < answer:
        answer = result
            
print answer