#![allow(unused_mut, non_snake_case,unused_imports)]
use std::iter;
use std::cmp::{max, min, Ordering};
use std::iter::FromIterator;
use std::sync::{Arc,Mutex};

//　高速 EOF要
macro_rules! input {(source = $s:expr, $($r:tt)*) => {let mut iter = $s.split_whitespace();input_inner!{iter, $($r)*}};($($r:tt)*) => {let mut s = {use std::io::Read;let mut s = String::new();std::io::stdin().read_to_string(&mut s).unwrap();s};let mut iter = s.split_whitespace();input_inner!{iter, $($r)*}};}
macro_rules! input_inner {($iter:expr) => {};($iter:expr, ) => {};($iter:expr, $var:ident : $t:tt $($r:tt)*) => {let $var = read_value!($iter, $t);input_inner!{$iter $($r)*}};}
macro_rules! read_value {($iter:expr, ( $($t:tt),* )) => {( $(read_value!($iter, $t)),* )};($iter:expr, [ $t:tt ; $len:expr ]) => {(0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()};($iter:expr, chars) => {read_value!($iter, String).chars().collect::<Vec<char>>()};($iter:expr, usize1) => {read_value!($iter, usize) - 1};($iter:expr, $t:ty) => {$iter.next().unwrap().parse::<$t>().expect("Parse error")};}
// 低速 EOF不要
//macro_rules! input {(source = $s:expr, $($r:tt)*) => {let mut iter = $s.split_whitespace();let mut next = || { iter.next().unwrap() };input_inner!{next, $($r)*}};($($r:tt)*) => {let stdin = std::io::stdin();let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));let mut next = move || -> String{bytes.by_ref().map(|r|r.unwrap() as char).skip_while(|c|c.is_whitespace()).take_while(|c|!c.is_whitespace()).collect()};input_inner!{next, $($r)*}};}
//macro_rules! input_inner {($next:expr) => {};($next:expr, ) => {};($next:expr, $var:ident : $t:tt $($r:tt)*) => {let $var = read_value!($next, $t);input_inner!{$next $($r)*}};}
//macro_rules! read_value {($next:expr, ( $($t:tt),* )) => {( $(read_value!($next, $t)),* )};($next:expr, [ $t:tt ; $len:expr ]) => {(0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()};($next:expr, chars) => {read_value!($next, String).chars().collect::<Vec<char>>()};($next:expr, usize1) => {read_value!($next, usize) - 1};($next:expr, $t:ty) => {$next().parse::<$t>().expect("Parse error")};}

/*
 <url:>
 問題文============================================================
 =================================================================
 解説=============================================================
 ================================================================
 */

fn calc(N:usize,V:Vec<usize>) -> usize{
    let mut ret = 0;
    let mut T;

    let mut Lmin= 1000;
    let mut Lmax= 0;
    let Vi = V.clone();
    for (i,&Vi) in Vi.iter().enumerate(){
        for j in i+1..N{
            let Vj = V[j];
            T = 0;
            if i != 0{
                if Vi > Vj{
                    if Vi > Lmin{  T = max(T,Vi); }
                }else{
                    if Vi < Lmax{ T = max(T,max(Lmax,Vj)); }
                }
            }
            for k in i+1..j{
                if V[k] > Vi && V[k] > Vj{// 凸
                    T = max(T,V[k]); continue;
                }
                if V[k] < Vi && V[k] < Vj{// 凹
                    T = max(T,max(Vi,Vj)); continue;
                }

            }
            for k in j+1..N{
                if Vj > Vi { // 凸
                    if Vj > V[k]{  T = max(T,Vj);break; }
                }
                if Vj < Vi{
                    if Vj < V[k]{ T = max(T,max(Vi,V[k])); }
                }
            }
            ret += T;
        }
        Lmax = max(Lmax,V[i]);
        Lmin = min(Lmin,V[i]);
    }
    return ret;
}
fn main() {
    input!(N:usize,M:usize,E:[[usize;N];M]);

    let Ans = Arc::new(Mutex::new(vec![-1; M]));
    {
        for (i,V) in E.into_iter().enumerate(){
            let Ans = Ans.clone();
            std::thread::spawn(move || {
                let ret = calc(N, V);
                loop {
                    let mut Ans = Ans.lock().unwrap();
                    if Ans[i] == -1 {
                        Ans[i] = ret as i32;
                        break;
                    }
                }
            });
        }
    }

    loop {
        let mut Ans = Ans.lock().unwrap();
        let &minv = (*Ans).iter().min().unwrap();
        if minv != -1 {
            let Ans = (*Ans).clone();
            let (answer,_) =Ans.into_iter().enumerate().max_by_key(|&(_idx,item)| item).unwrap().clone();
            println!("{}",answer);
            break;
        }
    }
}