#include <iostream>
#include <fstream>
using namespace std;
ifstream f ("flip.in");
ofstream g ("flip.out");
int n,m;
long a[20][20],sumc,suml,sum;
int main()
{   f>>n>>m;
    for(int i=1;i<=n;i++)
        {for(int j=1;j<=m;j++)
           { f>>a[i][j];
             suml+=a[i][j];
             sumc+=a[j][i];
            }
            if(suml>(suml*-1)) sum+=suml;
                else sum+=suml*-1;
            suml=0;
            if(sumc>(sumc*-1)) sum+=sumc;
                else sum+=sumc*-1;
            sumc=0;
        }
        g<<sum;
    return 0;
}