#include <bits/stdc++.h>

using namespace std;

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

const int dim = 5e4+1;

int x[dim], y[dim];

int main()
{
    int n, dx, dy;
    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 ans = 0;

    for (int i=1; i<=n; i++)
    {
        if (x[n-i+1] - x[i] <= dx)
            break;
        ans += x[n-i+1] - x[i] - dx;
    }

    for (int i=1; i<=n; i++)
    {
        if (y[n-i+1] - y[i] <= dy)
            break;
        ans += y[n-i+1] - y[i] - dy;
    }

    out << ans;

    return 0;
}