#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{int N,M,i,j;
long long a[17][17],S1=0,S2=0,S=0;
fin>>N>>M;
for(i=1;i<=N;i++)
{for(j=1;j<=M;j++)
{
   fin>>a[i][j];
   S1=S1+a[i][j];
   S2=S2+(-1)*a[i][j];
}
if(S2>S1)S=S+S2;
else S=S+S1;
S2=0;S1=0;
}
S1=0;S2=0;
for(j=1;j<=M;j++)
{
    for(i=1;i<=N;i++)
    {S1=S1+a[i][j];
     S2=S2+(-1)*a[i][j];}
    if(S2>S1){S=S-S1;S=S+S2;}
    S1=0;S2=0;
}
fout<<S;

    return 0;
}