use std::io::*;
const INF: usize = 1usize << 60;
fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();
    let m: usize = itr.next().unwrap().parse().unwrap();
    let a: Vec<Vec<usize>> = (0..n)
        .map(|_| {
            (0..n)
                .map(|_| itr.next().unwrap().parse().unwrap())
                .collect()
        })
        .collect();

    let mut ans = INF;
    for S in 0..1 << n + 2 {
        let cnt = (S as u32).count_ones() as usize;
        if cnt + n < m || cnt > m {
            continue;
        }

        let mut used = vec![vec![false; n]; n];
        let mut cost = 0;
        for i in 0..n {
            if S >> i & 1 == 1 {
                for j in 0..n {
                    cost += a[i][j];
                    used[i][j] = true;
                }
            }
        }
        if S >> n & 1 == 1 {
            for i in 0..n {
                if !used[i][i] {
                    cost += a[i][i];
                    used[i][i] = true;
                }
            }
        }
        if S >> n + 1 & 1 == 1 {
            for i in 0..n {
                if !used[n - 1 - i][i] {
                    cost += a[n - 1 - i][i];
                    used[n - 1 - i][i] = true;
                }
            }
        }
        let mut b = Vec::new();
        for j in 0..n {
            let mut tmp = 0;
            for i in 0..n {
                if !used[i][j] {
                    tmp += a[i][j];
                }
            }
            b.push(tmp);
        }
        b.sort();
        for i in 0..m - cnt {
            cost += b[i];
        }
        ans = std::cmp::min(ans, cost);
    }
    println!("{}", ans);
}