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#include <iostream>
#include <fstream>
using namespace std;
long i,m,n,j,b[20];
ifstream f("flip.in");
ofstream g("flip.out");
int nr,v[17][17],s,best;
void citire(){
f>>n>>m;
for(i=1;i<=n;i++){
for(j=1;j<=m;j++){
f>>v[i][j];
}
}
f.close();}
void letsvoyo(){int s=0;
for(i=1;i<=n;i++){int nr=0;
for(j=1;j<=m;j++){
nr+=v[i][j]*b[j]; // Partea "Oarecum" Dinamica
}
s+=max(nr,-nr);}
best=max(best,s);
}
void back(int k){k;
if(k==m+1){letsvoyo();return ;}
b[k]=-1;
back(k+1); // Backtracking
b[k]=1;
back(k+1);
}
int main()
{citire();
back(1);g<<best;
g.close();
return 0;
}