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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int n,m,i,j,a[100][100],c,maxin,s,maxfi;// maxin=max initial
int main()
{
maxin=0;maxfi=0;
f>>n>>m;
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
f>>c;
a[i][j]=c;
maxin=maxin+a[i][j];
maxfi=maxfi+a[i][j]*(-1);
if(maxfi>maxin)a[i][j]=a[i][j]*(-1);
s=a[i][j]+s;
}
}
cout<<s;
}