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#include <fstream>
using namespace std;
int main()
{
fstream f("flip.in",ios::in);
fstream g("flip.out",ios::out);
int a[100][100],n,m,i,j,sum;
f>>n>>m;
for (int i(0);i<n;i++)
for (int j(0);j<m;j++)
f>>a[i][j];
for (int i(0);i<n;i++)
for (int j(0);j<m;j++)
{
sum=sum+a[i][j];
if(sum<0)
{
for (int j(0);j<m;j++)
a[i][j]=a[i][j]*(-1);
sum=0;
}
else sum=0;
}
for (int j(0);j<m;j++)
for (int i(0);i<n;i++)
{
sum=sum+a[i][j];
if (sum<0)
{
for (int i(0);i<n;i++)
a[i][j]=a[i][j]*(-1);
sum=0;
}
else sum=0;
}
for (int i(0);i<n;i++)
for (int j(0);j<m;j++)
sum=sum+a[i][j];
g<<sum;
f.close();
g.close();
return 0;
}