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#include <iostream>
#include <fstream>
using namespace std;
int n,m,i,s2,j,s,a[16][16];
int main()
{
ifstream f("flip.in");
ofstream g("flip.out");
f>>n;
f>>m;
for(i=1;i<=n;i++){
s2=0;
for(j=1;j<=m;j++){
f>>a[i][j];
s2+=a[i][j];
}
if(s2<0){
for(j=1;j<=m;j++)
a[i][j]=(-1)*a[i][j];
s+=(-1)*s2;
}
else s+=s2;
}
for(j=1;j<=m;j++){
s2=0;
for(i=1;i<=n;i++){
f>>a[i][j];
s2+=a[i][j];
}
if(s2<0)
s=s-s2-s2;
}
g<<s;
f.close();
g.close();
return 0;
}