#include<iostream>
#include<string>
#include<algorithm>
#include<cassert>

using namespace std;
using ll = int_fast64_t;
#define int ll
#define rep(i,n) for(int (i) = 0 ; (i) < (n) ; (i)++)
#define rng(i,s,n) for(int (i) = (s) ; (i) < (n) ; (i)++)
template<class T>bool chmax(T & a, const T & b) { if (a < b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T & a, const T & b) { if (b < a) { a = b; return 1; } return 0; }
ll read() { ll u, k = scanf("%lld", &u); return u; }

int n;
int a[2000][2000];
int b[2000];//現在のコスト
int ans[2000];//答えのコスト
int c[2000][2];
void solve() {
	cin >> n;
	rep(i, n)rep(j, n) {
		a[i][j] = read() - 1;
		b[a[i][j]] += i + j - min(i, j);
		if (j < i) c[a[i][j]][1]++;
	}
	assert(1 <= n && n <= 1000);
	rep(i, n)rep(j, n) {
		assert(0 <= a[i][j] && a[i][j] < n);
	}
	rep(i, n) {
		ans[i] = b[i];
	}
	rep(i, n) {
		for (int j = 0; i - j >= 0; j++) {
			c[a[i - j][j]][0]++;
		}
		rep(j, n) {
			b[j] += c[j][0] - c[j][1];
		}
		rep(j, n) chmin(ans[j], b[j]);
		for (int j = 0; i + j + 1 < n; j++) {
			c[a[i + j + 1][j]][1]--;
		}
	}
	int sum = 0;
	rep(i, n) sum += ans[i];
	cout << sum << endl;
}
signed main() {
	solve();
}