use std::cmp;

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>().split_whitespace()
        .map(|e| e.parse().ok().unwrap()).collect()
}

fn read_vec2<T: std::str::FromStr>(n: usize) -> Vec<Vec<T>> {
    (0..n).map(|_| read_vec()).collect()
}


fn main() {
    let nm: Vec<usize> = read_vec();
    let n = nm[0];
    let m = nm[1];
    let a: Vec<Vec<usize>> = read_vec2(n);

    let mut ans: usize = 9999999;

    let mut total: usize = 0;
    for i in 0..n {
        for j in 0..n {
            total += a[i][j];
        }
    }

    for i in 0..1 << (n + 2) {
        let mut a0 = a.clone();
        let cost;
        let mut count = 0;
        for j in 0..(n + 2) {
            if (1 << j) & i == 0 && j < n {
                a0[j] = vec![0; n];
                count += 1;
            } else 
            if (1 << j) & i == 0 && j == n {
                for k in 0..n {
                    a0[k][k] = 0;
                }
                count += 1;
            } else 
            if (1 << j) & i == 0 && j > n {
                for k in 0..n {
                    a0[k][n - k - 1] = 0;
                }
                count += 1;
            }
        }
        //println!("count={}, a = {:?}", count, a0);

        if count > m {
            //println!("count > m");
            continue;
        } else {
            let mut line_sum: Vec<usize> = Vec::new();
            for j in 0..n {
                let mut sum = 0;
                for k in 0..n {
                    sum += a0[k][j];
                }
                line_sum.push(sum);
            }
            line_sum.sort_unstable();

            for j in 0..cmp::min(m - count, n) {
                line_sum[j] = 0
            }

            let mut remain = 0;
            for j in 0..n {
                remain += line_sum[j];
            }

            cost = total - remain;
            if ans > cost {
                ans = cost;
            }
            //println!("cost = {}, ans = {}", cost, ans);
        }
    }

    println!("{}", ans);

}