#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin ("tribute.in");
ofstream fout ("tribute.out");
int N,Dx,Dy,s,X[50000],Y[50000];

void citire()
{
  fin>>N>>Dx>>Dy;
    for(int i=1;i<=N;i++)
     fin>>X[i]>>Y[i];
}

void rezolvare()
{
    sort(X+1,X+1+N);
    sort(Y+1,Y+1+N);

    for(int i=1;i<=N/2;i++)
    {
        s=s+max(X[N-i+1]-X[i]-Dx,0);
        s=s+max(Y[N-i+1]-Y[i]-Dy,0);
    }
}
int main()
{
 citire();
 rezolvare();
 fout<<s<<'\n';
    return 0;
}