#include <bits/stdc++.h>
using namespace std;

// エイリアス
using  ll = long signed long;
using ull = long unsigned long;
using  ld = long double;
using   P = pair<int, int>;
using llP = pair<ll, ll>;
using DoP = pair<double, double>;

// 汎用マクロ
#define ALL(a) (a).begin(), (a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define FOREACH(i,q) for (auto &i : q)
#define UNIQUE(v) do { sort((v).begin(), (v).end()); (v).erase(unique((v).begin(), (v).end()), (v).end()); } while (false)
#define SZ(x) ((int)(x).size())
template <class T>inline bool chmin(T &a, const T b) {if (a > b) { a = b; return true;} return false;}
template <class T>inline bool chmax(T &a, const T b) {if (a < b) { a = b; return true;} return false;}
template <class T>inline void line_out(const vector<T> vec) {int n = SZ(vec); rep(i, n) { cout << vec[i]; if(i < n-1) cout << " ";}cout << endl;}
const int di[] = {0, 1, 0, -1, 1, 1, -1, -1};
const int dj[] = {1, 0, -1, 0, 1, -1, 1, -1};
const int INF = 1 << 28;
const ll INF64 = 1ll << 60;
const int mod = 1000000007;
//const int mod = 998244353;
struct mint
{
  ll x; // typedef long long ll;
  mint(ll x = 0) : x((x % mod + mod) % mod) {}
  mint operator-() const { return mint(-x); }
  mint &operator+=(const mint a)
  {
    if ((x += a.x) >= mod)
      x -= mod;
    return *this;
  }
  mint &operator-=(const mint a)
  {
    if ((x += mod - a.x) >= mod)
      x -= mod;
    return *this;
  }
  mint &operator*=(const mint a)
  {
    (x *= a.x) %= mod;
    return *this;
  }
  mint operator+(const mint a) const
  {
    mint res(*this);
    return res += a;
  }
  mint operator-(const mint a) const
  {
    mint res(*this);
    return res -= a;
  }
  mint &operator++()
  {
    if ((x += 1) >= mod)
      x -= mod;
    return *this;
  }
  mint &operator--()
  {
    if ((x += mod - 1) >= mod)
      x -= mod;
    return *this;
  }
  mint operator*(const mint a) const
  {
    mint res(*this);
    return res *= a;
  }
  mint pow(ll t) const
  {
    if (!t)
      return 1;
    mint a = pow(t >> 1);
    a *= a;
    if (t & 1)
      a *= *this;
    return a;
  }

  // for prime mod
  mint inv() const
  {
    return pow(mod - 2);
  }
  mint &operator/=(const mint a)
  {
    return (*this) *= a.inv();
  }
  mint operator/(const mint a) const
  {
    mint res(*this);
    return res /= a;
  }
};


int main()
{
  int n, C; cin >> n >> C;
  vector<vector<int>> d(C+1, vector<int>(C+1));
  rep(i, C) rep(j, C) cin >> d[i+1][j+1];

  vector<vector<int>> c(n+1, vector<int>(n+1));
  rep(i, n) rep(j, n) cin >> c[i+1][j+1];

  vector<int> z(C+1, 0), o(C+1, 0), t(C+1, 0);
  for(int i = 1; i <= n; ++i) {
    for(int j = 1; j <= n; ++j) {
      if((i+j)%3==0) ++z[c[i][j]];
      if((i+j)%3==1) ++o[c[i][j]];
      if((i+j)%3==2) ++t[c[i][j]];
    }
  }

  int ans = INF;
  for(int zero = 1; zero <= C; ++zero) {
    for(int one = 1; one <= C; ++one) {
      if(zero == one) continue;
      for(int two = 1; two <= C; ++two) {
        if(two == zero || two == one) continue;
        int res = 0;
        for(int color = 1; color <= C; ++color) {
          res += d[color][zero]*z[color] + d[color][one]*o[color] + d[color][two]*t[color];
        }
        chmin(ans, res);
      }
    }
  }
  cout << ans << endl;
}


Measured memory_bytes: 4552