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#include <iostream>
#include <cstdio>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("tribute.in");
ofstream fout("tribute.out");
const int N = 50000;
int coordx[N], coordy[N];
int main()
{
int n,dx,dy,i,ans;
fin >> n >> dx >> dy;
for(i=0; i<n; i++)
fin >> coordx[i] >> coordy[i];
sort(coordx, coordx + n);
sort(coordy, coordy + n);
ans = 0;
for(i=0; i<n; i++)
ans += max(coordx[n-i-1] - coordx[i] - dx, 0);
for(i=0; i<n; i++)
ans += max(coordy[n-i-1] - coordy[i] - dy, 0);
fout << ans << "\n";
return 0;
}