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

t1 = [int(x) for x in raw_input().strip().split()]
t2 = [int(x) for x in raw_input().strip().split()]
t3 = [int(x) for x in raw_input().strip().split()]
inp = [t1,t2,t3]

def cost(a,b):
	cost=0
	for i in range(3):
		for j in range(3):
			cost+=abs(a[i][j]-b[i][j])
	return cost

mc=500000000
for i in range(8):
	mc = min(mc,cost(m[i],inp))
print mc