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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");
int main()
{
int a[17][17],n,m,i,j,s;
//citire matrice
fin>>n>>m;
for (i=1;i<=m;i++)
{
for (j=1;j<=n;j++)
fin>>a[i][j];}
//verificare linie
for (i=1;i<=m;i++)
{ s=0;
for (j=1;j<=n;j++)
s=s+a[i][j];
if (s<0)
a[i][j]=a[i][j]*(-1);
}
//verificare linie
for (j=1;j<=n;j++)
{ s=0;
for (i=1;i<=m;i++)
s=s+a[i][j];
if (s<0)
a[i][j]=a[i][j]*(-1);
}
//suma maxima
s=0;
for (i=1;i<=m;i++)
{for (j=1;j<=n;j++)
s=s+a[i][j];}
fout<<s;
return 0;
}