#include <bits/stdc++.h>

using namespace std;

ifstream in("flip.in");
ofstream out("flip.out");

int n, m, a[20][20], stare, res;

int coloane(int s){
    int sumt=0, suml=0;
    for(int i=1; i<=n; i++){
        suml=0;
        for(int j=1; j<=m; j++){
            if((s&(1<<(j-1)))!=0){
                suml=suml-a[i][j];
            }else{
                suml=suml+a[i][j];
            }
        }
        sumt+=abs(suml);
    }
    return sumt;
}

int main()
{
    in>>n>>m;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            in>>a[i][j];
        }
    }
    stare=(1<<m)-1;
    for(int i=0; i<=stare; i++){
        res=max(res,coloane(i));
    }
    out<<res;
    return 0;
}