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using namespace std;
#include <fstream>
#include <vector>
ifstream fin("flip.in");
ofstream fout("flip.out");
int m, n, max1=0;
int l[16];
int t[16][16];
vector <bool> v(17, 0);
int main()
{
int i, j, k, gata=0, s, s1;
fin>>m>>n;
for(i=0; i<n; i++)
for(j=0; j<m; j++)
{fin>>t[i][j]; l[i]+=t[i][j];}
while(!gata)
{
s=0;
for(j=0; j<m; j++)
{
s1=0;
for(i=0; i<n; i++)
if(v[i]==1) s1-=t[i][j];
else s1+=t[i][j];
if(s1<0) s1=-s1;
s+=s1;
}
if(s>max1) max1=s;
for(i=n-1; i>=0 && v[i]==1; i--) v[i]=0;
if(i>=0) v[i]=1;
else gata=1;
}
fout<<max1;
return 0;
}