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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int n,m,a[20][20],i,j,s,sc,sl;
int main()
{
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++)
{
sc=0;
for(j=1;j<=n;j++)
sc=sc+a[i][j];
if(sc>0) s=s+sc;
else s=s-sc;
}
for(j=1;j<=n;j++)
{
sl=0;
for(i=1;i<=n;i++)
sl=sl+a[i][j];
if(sl<0)s=s-2*sl;
}
g<<s;
}