u = []
for i in range(3): u += list(map(int, input().strip().split()))[:3]
l = []
l.append([4, 9, 2, 3, 5, 7, 8, 1, 6])
l.append([8, 1, 6, 3, 5, 7, 4, 9, 2])
l.append([2, 9, 4, 7, 5, 3, 6, 1, 8])
l.append([4, 3, 8, 9, 5, 1, 2, 7, 6])
l.append([6, 7, 2, 1, 5, 9, 8, 3, 4])
l.append([8, 3, 4, 1, 5, 9, 6, 7, 2])
l.append([6, 1, 8, 7, 5, 3, 2, 9, 4])
l.append([2, 7, 6, 9, 5, 1, 4, 3, 8])
m = None
for i in l:
    s = 0
    for j in range(9):
        s += abs(i[j]-u[j])
    if m == None:
        m = s
    elif s < m:
        m = s
print(m)