#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n, m;
  cin >> n >> m;

  vector<vector<int> > a(n, vector<int>(n));
  for (int i = 0; i < n; i++)
    for (int j = 0; j < n; j++)
      cin >> a[i][j];

  int ret = 1<<30;
  for (int mask = 0; mask < 1<<n; mask++) {
    for (int l = 0; l < 2; l++) {
      for (int r = 0; r < 2; r++) {
        vector<int> use(n);
        for (int i = 0; i < n; i++)
          if (mask & 1 << i)
            use[i] = (1<<n) - 1;
        if (l)
          for (int i = 0; i < n; i++)
            use[i] |= 1<<i;
        if (r)
          for (int i = 0; i < n; i++)
            use[i] |= 1<<(n-1-i);

        int cost = 0;
        for (int i = 0; i < n; i++)
          for (int j = 0; j < n; j++)
            if (use[i] & 1 << j)
              cost += a[i][j];
        
        int cnt = l + r + __builtin_popcountll(mask);
        if (cnt < m) {
          vector<int> sum(n);
          for (int j = 0; j < n; j++) {
            int tmp = 0;
            for (int i = 0; i < n; i++)
              if (!(use[i] & 1 << j))
                tmp += a[i][j];
            sum[j] = tmp;
          }
          sort(sum.begin(), sum.end());
          for (int i = 0; i < m - cnt; i++)
            cost += sum[i];
        }
        ret = min(ret, cost);
      }
    }
  }
  cout << ret << endl;
  
  return 0;
}