#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define all(s) (s).begin(),(s).end()
#define vcin(n) for(ll i=0;i<ll(n.size());i++) cin>>n[i]
#define rever(vec) reverse(vec.begin(), vec.end())
#define sor(vec) sort(vec.begin(), vec.end())
#define fi first
#define se second
//const ll mod = 998244353;
const ll mod = 1000000007;
const ll inf = 2000000000000000000ll;
static const long double pi = 3.141592653589793;
template<class T,class U> void chmax(T& t,const U& u){if(t<u) t=u;}
template<class T,class U> void chmin(T& t,const U& u){if(t>u) t=u;}
ll modPow(ll a, ll n, ll mod) { ll ret = 1; ll p = a % mod; while (n) { if (n & 1) ret = ret * p % mod; p = p * p % mod; n >>= 1; } return ret; }
int main() {
  /* mod は 1e9+7 */
  ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
  cout<< fixed << setprecision(10);
  ll n,m;
  cin>>n>>m;
  vector<vector<ll>> s(n,vector<ll>(n));
  for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){
      cin>>s[i][j];
    }
  }
  ll ans=inf;
  for(int a=0;a<2;a++){
    for(int b=0;b<2;b++){
      ll p=0;
      ll c=m-a-b;
      auto dp=s;
      if(a){
        for(int i=0;i<n;i++){
          p+=dp[i][i];
          dp[i][i]=0;
          p+=dp[i][i];
        }
      }
      if(b){
        for(int i=0;i<n;i++){
          p+=dp[i][n-i-1];
          dp[i][n-i-1]=0;
          p+=dp[i][n-i-1];
        }
      }
      vector<ll> f(n);
      for(int i=0;i<n;i++){
      ll tmp=0;
        for(int j=0;j<n;j++){
          tmp+=dp[i][j];
        }
        f[i]=tmp;
      }
      for(int i=0;i<(1<<n);i++){
        ll e=c;
        ll tmp=0;
        ll o=i;
        for(int j=0;j<n;j++){
          if(o%2==1){
            tmp+=f[j];
            e--;
          }
          o/=2;
        }
        ll z=tmp;
    //    cout<<tmp+p<<endl;
        vector<ll> d(n);
        for(int j=0;j<n;j++){
          ll tmp2=0;
          ll z=i;
          for(int k=0;k<n;k++){
            if(z%2==0){
              tmp2+=dp[k][j];
            }
            z/=2;
          }
          d[j]=tmp2;
        }
        sor(d);
        for(int j=0;j<e;j++){
          tmp+=d[j];
        }
       chmin(ans,tmp+p);
      }
    }
  }
  cout<<ans<<endl;
}