arr=[]
for j in range(3):
	temp=[int(x) for x in input().split()]
	arr.append(temp)
def compare(arr,arr2):
    c=0
    for i in range(3):
        for j in range(3):
            if(not(arr[i][j]==arr2[i][j])):
                c=c+abs(arr[i][j]-arr2[i][j])
    return c
m=float('inf')
x=[[[8,1,6],[3,5,7],[4,9,2]] , [[2, 9, 4], [7, 5, 3], [6, 1, 8]] , [[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]]]
for j in range(8):
    m=min(m,compare(arr,x[j]))
    arr2=arr
print(m)