#include <iostream>
#include <stdio.h>
#include <algorithm>
#define NMax 50002
#define INF 999999999
using namespace std;
int N,Vx[NMax],Vy[NMax],sol,x,y;

int main()
{
    freopen("tribute.in","r",stdin);
    freopen("tribute.out","w",stdout);
    scanf("%d%d%d",&N,&x,&y);
    for(int i=1;i<=N;i++)
    {
        scanf("%d%d",&Vx[i],&Vy[i]);
    }
    sort(Vx+1,Vx+N+1);
    sort(Vy+1,Vy+N+1);

    for(int i=1;i<=N/2;i++)
    {
        sol+=max(Vx[N-i+1]-Vx[i]-x,0);
        sol+=max(Vy[N-i+1]-Vy[i]-y,0);
    }
    printf("%d\n",sol);
}