#include<fstream>
using namespace std;
int main()
{ 
    long i,j,n,m,a[30][30],s1[30],s2[30],s;
    ifstream f("flip.in", ios::in);
    ofstream g("flip.out", ios::out);
    f>>n;
    f>>m;
    for(i=1;i<=n;i++)
    for(j=1;j<=m;j++)
    f>>a[i][j];
    for(i=1;i<=n;i++)
    {
                     s1[i]=0;
                     for(j=1;j<=m;j++)
                     s1[i]=s1[i]+a[i][j];}
    for(j=1;j<=m;j++)
    {
                     s2[j]=0;
                     for(i=1;i<=n;i++)
                     s2[j]=s2[j]+a[i][j];}
    for(i=1;i<=n;i++)
    if(s1[i]<s1[i]*(-1))
    s1[i]=0-s1[i];
    for(j=1;j<=m;j++)
    if(s2[j]<s2[j]*(-1))
    s2[j]=0-s2[j];
    s=0;
    for(i=1;i<=n;i++)
    s=s+s1[i];
    for(j=1;j<=m;j++)
    s=s+s2[j];
    g<<s;
    return 0;}