import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import itertools

N = int(readline())
A = tuple(map(int, read().split()))

imos = [[0] * (N + N + N) for _ in range(N + 1)]

for i, x in enumerate(A):
    h, w = divmod(i, N)
    A = imos[x]
    n = h + N
    A[0] += n
    A[1] -= n + 1
    A[n - w + 1] += 1
    A[n + w + 1] += 1

answer = 0
for A in imos[1:]:
    A = itertools.accumulate(A)
    A = itertools.accumulate(A)
    answer += min(itertools.islice(A, N, N + N))

print(answer)