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#include <fstream>
using namespace std;
int main()
{int N, M, m[16][16], C, L, i, j, S=0;
ifstream fin("flip.in");
ofstream fout("flip.out");
fin>>N>>M;
for(i=1; i<=N, i++)
{C[i]=0;
for(j=1; j<=M; j++)
{fin>>m[i][j];
C[i]+=m[i][j];}
}
for(i=1; i<=N; ++i)
if(C[i]<0)
for(j=1; j<=M; j++)
m[i][j]=m[i][j]*(-1);
for(j=1; j<=M; ++j)
{L[j]=0;
for(i=1; i<=N; ++i)
L[j]+=m[i][j];
}
for(j=1; j<=M; ++j)
if(L[j]<0)
for(i=1; i<=N; i++)
m[i][j]=m[i][j]*(-1);
for(i=1; i<=N; i++)
for(j=1; j<=M; j++)
S+=m[i][j];
fout<<S;
return 0;
}