#![allow(unused_imports, unused_macros, dead_code)]
use std::{cmp::*, collections::*};

fn main() {
    let mut sc = Scanner::new();
    let n: usize = sc.cin();
    let m: usize = sc.cin();

    let mut x = vec![vec![0; n]; n];
    for i in 0..n {
        for j in 0..n {
            let a: u64 = sc.cin();
            x[i][j] = a;
        }
    }

    let mut ans = 0;
    for _ in 0..m {
        ans += greedy(&mut x);
    }
    put!(ans);
}

fn greedy(x: &mut Vec<Vec<u64>>) -> u64 {
    let n = x.len();
    let mut mx = 200 * n as u64;
    {
        let s: u64 = (0..n).map(|i| x[i][i]).sum();
        if s > 0 {
            mx = min!(mx, s);
        }
    }
    {
        let s: u64 = (0..n).map(|i| x[i][n - 1 - i]).sum();
        if s > 0 {
            mx = min!(mx, s);
        }
    }
    for i in 0..n {
        let s: u64 = (0..n).map(|j| x[i][j]).sum();
        if s > 0 {
            mx = min!(mx, s);
        }
    }
    for i in 0..n {
        let s: u64 = (0..n).map(|j| x[j][i]).sum();
        if s > 0 {
            mx = min!(mx, s);
        }
    }
    {
        let s: u64 = (0..n).map(|i| x[i][i]).sum();
        if s == mx {
            for i in 0..n {
                x[i][i] = 0;
            }
            return mx;
        }
    }
    {
        let s: u64 = (0..n).map(|i| x[i][n - 1 - i]).sum();
        if s == mx {
            for i in 0..n {
                x[i][n - 1 - i] = 0;
            }
            return mx;
        }
    }
    for i in 0..n {
        let s: u64 = (0..n).map(|j| x[i][j]).sum();
        if s == mx {
            for j in 0..n {
                x[i][j] = 0;
            }
            return mx;
        }
    }
    for i in 0..n {
        let s: u64 = (0..n).map(|j| x[j][i]).sum();
        if s == mx {
            for j in 0..n {
                x[j][i] = 0;
            }
            return mx;
        }
    }
    return 0;
}

// {{{
use std::io::{self, Write};
use std::str::FromStr;

struct Scanner {
    stdin: io::Stdin,
    buffer: VecDeque<String>,
}
impl Scanner {
    fn new() -> Self {
        Self {
            stdin: io::stdin(),
            buffer: VecDeque::new(),
        }
    }
    fn cin<T: FromStr>(&mut self) -> T {
        while self.buffer.is_empty() {
            let mut line = String::new();
            let _ = self.stdin.read_line(&mut line);
            for w in line.split_whitespace() {
                self.buffer.push_back(String::from(w));
            }
        }
        self.buffer.pop_front().unwrap().parse::<T>().ok().unwrap()
    }
    fn chars(&mut self) -> Vec<char> {
        self.cin::<String>().chars().collect()
    }
    fn vec<T: FromStr>(&mut self, n: usize) -> Vec<T> {
        (0..n).map(|_| self.cin()).collect()
    }
}
fn flush() {
    std::io::stdout().flush().unwrap();
}
#[macro_export]
macro_rules! min {
    (.. $x:expr) => {{
        let mut it = $x.iter();
        it.next().map(|z| it.fold(z, |x, y| min!(x, y)))
    }};
    ($x:expr) => ($x);
    ($x:expr, $($ys:expr),*) => {{
        let t = min!($($ys),*);
        if $x < t { $x } else { t }
    }}
}
#[macro_export]
macro_rules! max {
    (.. $x:expr) => {{
        let mut it = $x.iter();
        it.next().map(|z| it.fold(z, |x, y| max!(x, y)))
    }};
    ($x:expr) => ($x);
    ($x:expr, $($ys:expr),*) => {{
        let t = max!($($ys),*);
        if $x > t { $x } else { t }
    }}
}
#[macro_export]
macro_rules! trace {
    ($x:expr) => {
        #[cfg(debug_assertions)]
        eprintln!(">>> {} = {:?}", stringify!($x), $x)
    };
    ($($xs:expr),*) => { trace!(($($xs),*)) }
}
#[macro_export]
macro_rules! put {
    (.. $x:expr) => {{
        let mut it = $x.iter();
        if let Some(x) = it.next() { print!("{}", x); }
        for x in it { print!(" {}", x); }
        println!("");
    }};
    ($x:expr) => { println!("{}", $x) };
    ($x:expr, $($xs:expr),*) => { print!("{} ", $x); put!($($xs),*) }
}
// }}}