#include<bits/stdc++.h>
using namespace std;
ifstream f("tribute.in");
ofstream g("tribute.out");
int n,i,a,b,x[50001],y[50001],s;
int main()
{
    for(f>>n>>a>>b,i=1;i<=n;++i)
        f>>x[i]>>y[i];
    for(sort(x+1,x+n+1),sort(y+1,y+n+1),i=1;i<=n/2;++i)
        s+=max(x[n-i+1]-x[i]-a,0)+max(y[n-i+1]-y[i]-b,0);
    g<<s;
    return 0;
}