l1 = input()
l2 = input()
l3 = input()
inp = ' '.join([l1, l2, l3])
templates = ('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',
             '4 9 2 3 5 7 8 1 6',
             '2 7 6 9 5 1 4 3 8')

def create_magic_square():
    diffs = []
    for t in templates:
        counter = 0
        if inp != t:
            for i in range(len(inp)):
                if inp[i] != t[i]:
                    counter += abs(int(inp[i]) - int(t[i]))
            diffs.append(counter)
        else:
            return 0
    return min(diffs)

if __name__ == '__main__':
    print(create_magic_square())