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#include <fstream>
#include <climits>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int a[17][17],n,m,smax=INT_MIN;
int suma(int x,int y)
{
int s=0;
for(int j=1;j<=m;j++)
s+=a[x][j]*-1;
for(int i=1;i<=n;i++)
if(i!=x)
s+=a[i][y]*-1;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(i!=x&&j!=y)
s+=a[i][j];
return s;
}
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
f>>a[i][j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
int ss;
ss=suma(i,j);
if(ss>smax)
smax=ss;
}
g<<smax;
return 0;
}