#include <iostream>
#include <fstream>
#include <algorithm>
#define NMAX 50005
using namespace std;

ifstream in("tribute.in");
ofstream out("tribute.out");

int n,dx,dy;
int x[NMAX],y[NMAX],ssx[NMAX],ssy[NMAX],sdx[NMAX],sdy[NMAX];
int main()
{
    in>>n>>dx>>dy;
    for(int i=1;i<=n;++i){
        in>>x[i]>>y[i];
    }
    sort(x+1,x+n+1);
    sort(y+1,y+n+1);
    int rx=0,ry=0;
    for(int i=1;i<=n/2;++i){
        rx+=max(x[n-i+1]-x[i]-dx,0);
        ry+=max(y[n-i+1]-y[i]-dy,0);
    }
    out<<rx+ry;
    return 0;
}