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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("filip.in");
ofstream g("filip.out");
int a[17][17],n,m,t,s,s1,suma;
int calcul_linie(){
int aux;
s=0;
for(int i=1;i<=n;i++){
aux=0;
for(int j=1;j<=m;j++){
aux+=a[i][j];
}
if(aux<0){
aux=-aux;
for(t=1;t<=m;t++)
a[i][t]=-a[i][t];
}
s+=aux;
}
}
int calcul_col(){
int aux;
s1=0;
for(int j=1;j<=m;j++){
aux=0;
for(int i=1;i<=n;i++){
aux+=a[i][j];
}
if(aux<0){
aux=-aux;
for(int z=1;z<=n;z++)
a[z][j]=-a[z][j];
}
s1+=aux;
}
}
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
f>>a[i][j];
calcul_linie();
calcul_col();
int smax;
if(s>s1) smax=s;
else smax=s1;
g<<smax;
}