//
// Created by zeronosu77108 on Jan 15, 2021.
//
#include <iostream>
#include <iomanip>
#include <vector>
#include <utility>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <algorithm>
#include <queue>
#include <cmath>
#include <numeric>
#include <set>
#include <complex>
#include <optional>
#include <climits>

using namespace std;
struct aaa{aaa(){cin.tie(nullptr); ios::sync_with_stdio(false); cout<<fixed<<setprecision(20);};}aaa;
template <class T>ostream &operator<<(ostream &o,const vector<T>&v){o<<"{";for(int i=0;i<(int)v.size();i++)o<<(i>0?", ":"")<<v[i];o<<"}";return o;}
#define debug(v) {cerr<<"\033[1;36m[debug]\033[m "<<#v<<" : "<<(v)<<endl;}

int main() {
    int n, m;
    cin >> n >> m;

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

    long comb = (1L<<m) - 1;
    long ans = LONG_MAX;
    while (comb < 1L << (2*n+2)) {
        long x=comb&-comb, y=comb+x;
        comb = ((comb & ~y) / x >> 1) | y;

        long d = comb & 3;
        long r = ((comb)>>2) & ((1<<n)-1);
        long c = ((comb)>>(n+2));

        long sum = 0;
        vector used(n, vector(n, false));
        if (d & 1) {
            for (int i=0; i<n; i++) {
                if (used[i][i]) continue;
                used[i][i] = true;
                sum += a[i][i];
            }
        }

        if (d & 2) {
            for (int i=0; i<n; i++) {
                if (used[i][n-i-1]) continue;
                used[i][n-i-1] = true;
                sum += a[i][n-i-1];
            }
        }

        for (int i=0; i<n; i++) {
            if (r>>i&1) {
                for (int j=0; j<n; j++) {
                    if (used[i][j]) continue;
                    used[i][j] = true;
                    sum += a[i][j];
                }
            }
        }


        for (int i=0; i<n; i++) {
            if (c>>i&1) {
                for (int j=0; j<n; j++) {
                    if (used[j][i]) continue;
                    used[j][i] = true;
                    sum += a[j][i];
                }
            }
        }
        ans = min(ans, sum);
    }

    cout << ans << endl;
}