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#include <fstream>
using namespace std;
ifstream in ("flip.in");
ofstream out ("flip.out");
int main()
{
int n,m,M[16][16],i,j,s=0,negs=0,stot=0;
in>>n>>m;
for (i=0; i<n; i++)
for (j=0; j<m; j++)
in>>M[i][j];
for (j=0; j<m; j++)
{
for(i=0; i<n; i++)
{
s=s+M[i][j];
negs=negs+M[i][j]*(-1);
}
if (s>negs)
stot=s+stot;
else
stot=negs+stot;
s=0;
negs=0;
}
out<<stot;
return 0;
}