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#include <fstream>
//#include <iostream>
using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");
int a[21][21],n,m,sa,sb,sumtot;
int main(){
int i,j;
fin >> n >> m;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
fin >> a[i][j];
fin.close();
for(i = 1; i <= m; i++)
{
sa=sb=0;
for(j = 1;j <= n; j++)
{
sa+=a[j][i];
sb+=(a[j][i]*-1);
}
// cout << sa <<" "<<sb<<"\n";
sumtot+=max(sa,sb);
}
fout << sumtot << "\n";
fout.close();
return 0;
}