import sys
from itertools import accumulate

def input(): return sys.stdin.readline().strip()
def list2d(a, b, c): return [[c] * b for i in range(a)]
def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)]
def list4d(a, b, c, d, e): return [[[[e] * d for j in range(c)] for j in range(b)] for i in range(a)]
def ceil(x, y=1): return int(-(-x // y))
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)]
def Yes(): print('Yes')
def No(): print('No')
def YES(): print('YES')
def NO(): print('NO')
sys.setrecursionlimit(10 ** 9)
INF = 10 ** 19
MOD = 10 ** 9 + 7
EPS = 10 ** -10

N = INT()
imos1 = list2d(N, N+1, 0)
imos2 = list2d(N, N+1, 0)
fixed = [0] * N
ll = 0
rr = N
for i in range(N):
    for j, a in enumerate([a-1 for a in LIST()]):
        lr = max(i-j, 0)
        rl = min(i+j+1, N)
        imos1[a][ll] += 1
        imos1[a][lr] -= 1
        imos2[a][rl] += 1
        imos2[a][rr] -= 1
        fixed[a] += j
for i in range(N):
    imos1[i] = list(accumulate(imos1[i]))
    imos2[i] = list(accumulate(imos2[i]))
    imos1[i] = list(accumulate(imos1[i][::-1]))[::-1]
    imos2[i] = list(accumulate(imos2[i]))

ans = 0
for a in range(N):
    mn = INF
    for i in range(N):
        mn = min(mn, imos1[a][i] + imos2[a][i] + fixed[a])
    ans += mn
print(ans)