#include <bits/stdc++.h>

using namespace std;
void citire(int a[100][100],int &n,int &m)
{
    ifstream f("flip.in");
    f>>n>>m;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
            f>>a[i][j];
}
int rezolva(int a[100][100],int n,int m,int x)
{
    int s,rez=0;
    for(int i=1;i<=n;i++)
    {
        s=0;
        for(int j=1;j<=m;j++)
        {
            s+=(x & (1<<(j-1)))?a[i][j]:-a[i][j];
       /**     if(x & (1<<(j-1)))
                cout<<"-";
            else
                cout<<"+";  **/
        }
        rez+=abs(s);
///      cout<<endl;
    }
  ///  cout<<endl;
    return rez;
}

int main()
{
    int a[100][100],n,m,rez=0;
    ofstream g("flip.out");
    citire(a,n,m);
    for(int ocupat=0;ocupat<(1<<m);ocupat++)
        rez=max(rez,rezolva(a,n,m,ocupat));
    g<<rez;
    return 0;
}