#include <fstream>
#include <algorithm>

using namespace std;

int x[50001], y[50001];

int main()
{
    ifstream cin("tribute.in");
    ofstream cout("tribute.out");
    int n, dx, dy, i, sol;
    cin >> n >> dx >> dy;
    for (i = 1; i <= n; i++)
        cin >> x[i] >> y[i];
    sort(x + 1, x + n + 1);
    sort(y + 1, y + n + 1);
    sol = 0;
    for (i = 1; i <= n; i++)
    {
        if (x[i + 1] - x[n - i] - dx > 0)
            sol += x[i + 1] - x[n - i] - dx;
        if (y[i + 1] - y[n - i] - dy > 0)
            sol += y[i + 1] - y[n - i] - dy;
    }
    cout << sol;
    return 0;
}