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#include <fstream>
using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");
long long int n,m,v[20][20], rasp=0;
void cer(int x[])
{
long long int sum=0;
for(int j=1;j<=m;j++)
{
long long int s=0;
for(int i=1;i<=n;i++)
{
s=s+v[i][j]*x[i];
}
if(s<0)
{
sum=sum-s;
}
else
{
sum=sum+s;
}
}
if(sum>rasp)
{
rasp=sum;
}
}
void umplere(int i, int x[], int k)
{
x[i]=k;
if(i<n)
{
umplere(i+1, x, 1); umplere(i+1, x, -1);
}
else
{
cer(x);
}
}
int main()
{
int x[20];
fin>>n>>m;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
fin>>v[i][j];
}
}
umplere(0,x,1);
fout<<rasp;
}