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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");
int main()
{
int a[16][16],i,j,max=-32000,n,m,s=0,x;
fin>>n;
fin>>m;
for(i=0;i<n;i++){
for(j=0;j<m;j++){
fin>>a[i][j];
s=s+a[i][j];
}
}
x=s;
for(i=0;i<n;i++){
s=x;
for(j=0;j<m;j++){
s=s-a[i][j]+a[i][j]*(-1);
}
if(x<s) x=s;
}
for(j=0;j<m;j++){
s=x;
for(i=0;i<n;i++){
s=s-a[i][j]+a[i][j]*(-1);
}
if(x<s) x=s;
}
fout<<x;
return 0;
}