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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");
int main()
{
int N, M, i, j, a[17][17], x=0, y=0;
fin>>N>>M;
for(i=1;i<=N;++i)
for(j=1;j<=M;j++)
fin>>a[i][j];
for(i=1;i<=N;i++)
for(j=1;j<=M;j++)
{
if (a[i][j]>0) x=x+a[i][j];
else y=y+a[i][j];
}
if (x>y) fout<<x;
else for(i=1;i<=N;i++)
{for(j=1;j<=M;j++)
y=y+(a[i][j]*-1);
fout<<y;}
fin.close();
fout.close();
return 0;
}