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#include <fstream>
using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");
int mat[17][17],n,m;
int main()
{
int i,j,s=0,cs;
fin>>n>>m;
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
fin>>mat[i][j], s+=mat[i][j];
for(i=1; i<=n; i++)
{
cs=s;
for(j=1; j<=m; j++)
cs-=2*mat[i][j];
if(cs>s)
s=cs;
}
for(j=1; j<=m; j++)
{
cs=s;
for(i=1; i<=n; i++)
cs-=2*mat[i][j];
if(cs>s)
s=cs;
}
fout<<s;
fin.close();
fout.close();
return 0;
}