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#include <iostream>
#include<fstream>
using namespace std;
int n,m,i,j,mn=999,mn1=999,p1,p2,a[20][20],s;
int main()
{
ifstream f("flip.in");
ofstream g("flip.out");
f>>n>>m;
for(i=1;i<=n;i++)
{for(j=1;j<=m;j++)
{
f>>a[i][j];
s=s+a[i][j];
}
if(s<0)for(j=1;j<=m;j++)a[i][j]=a[i][j]*(-1);
s=0;
}
for(i=1;i<=m;i++)
{for(j=1;j<=n;j++)s=s+a[j][i];
if(s<0)for(j=1;j<=n;j++)a[j][i]=a[j][i]*(-1);
s=0;}
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)s=s+a[i][j];
g<<s;
return 0;
}