# code template

from sys import stdin

def get():
	return testcase.next().strip()


testcase = stdin
# solution starts here

arr = []
for i in range(3):
	arr.extend(map(int, get().split()))

cost = []

vv = [[8,1,6,3,5,7,4,9,2], [6,1,8,7,5,3,2,9,4], [4,3,8,9,5,1,2,7,6], [2,7,6,9,5,1,4,3,8], [4,9,2,3,5,7,8,1,6], [2,9,4,7,5,3,6,1,8], [8,3,4,1,5,9,6,7,2], [6,7,2,1,5,9,8,3,4]]

for i in vv:
	tmp = zip(i, arr)
	c = 0
	for i in tmp:
		c += abs(i[0] - i[1])
	cost.append(c)

print min(cost)