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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");
int main()
{
unsigned int N, M, i, j, k, l;
fin>>N>>M;
int tabla[N][M], suma = 0, suma_temp = 0;
for(i = 0; i < N; i++)
for(j = 0; j < M; j++)
fin>>tabla[i][j];
for(i = 0; i < N; i++){
suma = 0;
for(j = 0; j < M; j++){
suma += tabla[i][j];
}
if(suma < 0){
suma *= -1;
for(j = 0; j < M; j++){
if(-tabla[i][j] < 0)
suma += tabla[i][j];
}
if(suma > 0)
for(j = 0; j < M; j++)
tabla[i][j] *= -1;
}
}
for(j = 0; j < M; j++){
suma = 0;
for(i = 0; i < N; i++){
suma += tabla[i][j];
}
if(suma < 0){
suma *= -1;
for(i = 0; i < N; i++){
if(-tabla[i][j] < 0)
suma += tabla[i][j];
}
if(suma > 0)
for(i = 0; i < N; i++)
tabla[i][j] *= -1;
}
}
for(i = 0, suma = 0; i < N; i++)
for(j = 0; j < M; j++)
suma += tabla[i][j];
fout<<suma;
}