#include <iostream>

using namespace std;

int main()
{
    freopen("flip.in", "r", stdin);
    freopen("flip.out", "w", stdout);
    int n, m;
    cin>>n>>m;
    int v[n+1][m+1];
    for(int i=1; i<=n; i++)
        for(int j=1; j<=m; j++)
            cin>>v[i][j];
    int maxim=0;
    for(int mask=0; mask<=(1<<m)-1; mask++)
    {
        int suma=0;
        for(int i=1; i<=n; i++)
        {
            int s=0;
            for(int j=1; j<=m; j++)
                if(mask&(1<<(j-1)))
                    s+=v[i][j];
                else
                    s-=v[i][j];
            suma+=abs(s);
        }
        maxim=max(maxim, suma);
    }
    cout<<maxim;
    return 0;
}