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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");
int n,m,tabla[20][20];
int sum1=0;
int sum2=0;
int main()
{
fin>>n>>m;
for(int i=0; i<n; i++){
for(int j=0; j<m; j++){
fin>>tabla[i][j];
}
}
fin>>n>>m;
for(int i=0; i<n; i++){
for(int j=0; j<m; j++){
if(tabla[i][j]>0){
sum1+=tabla[i][j];
}else{
sum2-=tabla[i][j];
}
}
}
if(sum1<sum2)
fout<<sum2;
else
fout<<sum1;
}