N = int(input())
A = [list(map(int, input().split())) for _ in range(N)]


def f(a, b):
    return sum(abs(p-q) for p, q in zip(a, b))


ans = 10**18
for i in range(N):
    p = A[i]
    for j in range(i+1):
        q = A[j]
        r = [(x+y)//2 for x, y in zip(p, q)]
        ct = sum(f(r, a) for a in A)
        ans = min(ans, ct)

print(ans)