#include <iostream>
#include <fstream>
#include <cstdio>
#include <algorithm>

using namespace std;

int vl[50005];
int vc[50005];

int main()
{
    freopen("tribute.in", "r", stdin);
    freopen("tribute.out", "w", stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, dx, dy;
    cin >> n >> dx >> dy;
    for (int i=1; i<=n; i++) {
        cin >> vl[i] >> vc[i];
    }

    sort(vl+1, vl+n+1);
    sort(vc+1, vc+n+1);

    long long suma=0, diff;

    for (int i=1; i<=n/2; i++) {
        diff=vl[n-i+1]-vl[i]-dx;
        suma+=diff;

        diff=vc[n-i+1]-vc[i]-dy;
        suma+=diff;
    }
    cout << suma;
    return 0;
}