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#include <iostream>
#include <fstream>
using namespace std;
int test2(int a[17][17], int n, int m)
{int i,j,po,ne,s=0;
for (i=0;i<n;i++)
{po=ne=0;
for (j=0;j<m;j++)
if (a[i][j]>0)
po=po+a[i][j];
else ne=ne+a[i][j];
ne=-ne;
if (ne>po)
s=s+ne;
else s=s+po;
}
return s;
}
int test1(int a[17][17], int n, int m)
{int i,j,po,ne;
for (i=0;i<n;i++)
{po=ne=0;
for (j=0;j<m;j++)
if (a[j][i]>0)
po=po+a[j][i];
else ne=ne+a[j][i];
ne=-ne;
if (ne>po)
for (j=0;j<m;j++)
a[j][i]=-a[j][i];
}
return test2(a,n,m);
}
int main()
{int n,m,a[17][17],i,j;
ifstream f("flip.in");
ofstream g("flip.out");
f>>n;f>>m;
for (i=0;i<n;i++)
for (j=0;j<m;j++)
f>>a[i][j];
g<<test1(a,n,m);
}