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#include <fstream>
using namespace std;
int main()
{
int n,m,i,j,s1=0,s2=0,a[10000][10000],suma=0;
fstream f("flip.in");
ofstream o("flip.out");
f>>n>>m;
for(i=0;i<n;i++)
for(j=0;j<m;j++)
f>>a[i][j];
for (i=0;i<n;i++)
{
for (j=0;j<m;j++)
{
s1=s1+a[i][j];
s2=s2+a[i][j]*(-1);
}
if (s2>s1)
{for (j=0;j<m;j++)
{a[i][j]=a[i][j]*(-1);
suma=suma+a[i][j];}
} else
for (j=0;j<m;j++)
suma=suma+a[i][j];
s1=0; s2=0;
};
o<<suma;
return 0;
}