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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int main()
{
int n,m,a[100][100],s,k,suma=0,i,j;
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;
k=0;
for(j=1;j<=m;j++)
{
s=s+a[i][j];
k=k-a[i][j];
}
if(s<k)
{
for(j=1;j<=m;j++)
a[i][j]=-a[i][j];
//g<<"Interschimbare linia "<<i<<endl;
}
}
for(j=1;j<=m;j++)
{
s=0;
k=0;
for(i=1;i<=n;i++)
{
s=s+a[i][j];
k=k-a[i][j];
}
if(s<k)
{
for(i=1;i<=n;i++)
a[i][j]=-a[i][j];
//g<<"Interschimbare coloana "<<j<<endl;
}
}
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
suma=suma+a[i][j];
g<<suma;
return 0;
}