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#include <iostream>
#include <algorithm>
#include <fstream>
using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");
long long a[1001][1001],b[1001][1001];
int main()
{ int i,j,n,m,p,s1=0,s2=0,s=0;
fin>>n;
fin>>m;
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
fin>>a[i][j];
b[i][j]=a[i][j];
}
}
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
b[i][j]=(-1)*b[i][j];
}
}
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
s1=a[i][j]+s1;
s2=b[i][j]+s2;
}
if(s1>=s2)
{
s1=0;
s2=0;
}
else
{
for(j=1;j<=m;j++)
{
a[i][j]=b[i][j];
}
s1=0;
s2=0;
}
}
for(j=1;j<=m;j++)
{
for(i=1;i<=n;i++)
{
s1=a[i][j]+s1;
s2=b[i][j]+s2;
}
if(s1>=s2)
{
s1=0;
s2=0;
}
else
{
for(i=1;i<=n;i++)
{
a[i][j]=b[i][j];
}
s1=0;
s2=0;
}
}
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
s=s+a[i][j];
}
}
fout<<" "<<s;
return 0;
}