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#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
long long a[17][17],s,si,st;
int n,m,i,j;
int main(){
f>>n>>m;
for (i=1;i<=n;i++)
for (j=1;j<=m;j++)
f>>a[i][j];
for (i=1;i<=n;i++){
s=0;
si=0;
for (j=1;j<=m;j++){
s+=a[i][j];
si+=a[i][j]*(-1);
}
if (si>s)
for (j=1;j<=m;j++)
a[i][j]*=-1;}
for (j=1;j<=m;j++){
s=0;
si=0;
for (i=1;i<=n;i++){
s+=a[i][j];
si+=a[i][j]*(-1);
}
if (si>s)
for (i=1;i<=n;i++)
a[i][j]*=-1;}
for (i=1;i<=n;i++)
for (j=1;j<=m;j++)
st+=a[i][j];
g<<st<<'\n';
return 0;}