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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("flip.in");
ofstream out("flip.out");
int a[999999][16],n,m;
int main()
{
int i,j,sl,sc,sminc,sminl,s,ii,jj;
sl=0;
sminl=999999;
in>>n>>m;
for(i=1; i<=n; i++)
{sl=0;
for(j=1; j<=m; j++)
{
in>>a[i][j];
sl+=a[i][j];
}
if(sl<sminl)
{
ii=i;
sminl=sl;
}
}
sc=0;
sminc=999999;
for(j=1; j<=m; j++)
{sc=0;
for(i=1; i<=n; i++)
{
sc+=a[i][j];
}
if(sc<sminc)
{
jj=j;
sminc=sc;
}
}
s=0;
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
{
if(i==ii||j==jj)
a[i][j]=a[i][j]*(-1);
s+=a[i][j];
}
out<<s;
return 0;
}