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#include<iostream>
using namespace std;
int main()
{
freopen("flip.in","r",stdin);
freopen("flip.out","w",stdout);
int m,n,a[17][17],max=0,S=0,S2=0;
cin>>n;
cin>>m;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
cin>>a[i][j];
}
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
S=S+a[i][j];
}
if(S<0)
for(int j=1;j<=m;j++)
a[i][j]=a[i][j]*-1;
S=0;
for(int j=1;j<=m;j++)
{
for(int i=1;i<=n;i++)
S2+=a[i][j];
if(S2<0)
for(int i=1;i<=n;i++)
a[i][j]=a[i][j]*-1;
S2=0;
}
}
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
max=max+a[i][j];
cout<<max;
return 0;
}