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#include<fstream>
#include<iomanip>
using namespace std;
fstream fin("flip.in",ios::in),
fout("flip.out",ios::out);
long a[10000][16];
void afis(int L, int C)
{
int i,j;
for(i=1;i<=L;i++)
{
for(j=1;j<=C;j++)
fout<<setw(10)<<right<<a[i][j];
fout<<endl;
}
fout<<endl;
}
int main()
{
int i,j,N,M,s,S=0;
fin>>N>>M;
for(i=1;i<=N;i++)
for(j=1;j<=M;j++)
fin>>a[i][j];
for(i=1;i<=N;i++)
{
s=0;
for(j=i;j<=M;j++)
s+=a[i][j];
if(s<0)
for(j=1;j<=M;j++)
a[i][j]*=(-1);
}
for(j=1;j<=M;j++)
{
s=0;
for(i=1;i<=N;i++)
s+=a[i][j];
if(s<0)
{
S+=s*(-1);
}
else
{
S+=s;
}
}
fout<<S;
fin.close();
fout.close();
return 0;
}