#include <bits/stdc++.h>
using namespace std;
int mx=INT_MAX,my=INT_MAX,n,dx,dy,x,y,xin[50010],xsf[50010],yin[50010],ysf[50010],i,in;
int main()
{
    freopen("tribute.in","r",stdin);
    freopen("tribute.out","w",stdout);
    scanf("%d%d%d",&n,&dx,&dy);
    for(i=1; i<=n; ++i)
    {
        scanf("%d%d",&x,&y);
        xin[x]++;
        xsf[x]++;
        yin[y]++;
        ysf[y]++;
    }
    for(in=1; in<=2; ++in)
    {
        for(i=0; i<=50000; ++i)
        {
            xsf[i]+=xsf[i-1];
            ysf[i]+=ysf[i-1];
        }
        for(i=50000; i>=0; --i)
        {
            xin[i]+=xin[i+1];
            yin[i]+=yin[i+1];
        }
    }
    for(i=0; i<=50000; ++i)
    {
        if(i+dx<=50000&&xsf[i-1]+xin[i+dx+1]<mx)mx=xsf[i-1]+xin[i+dx+1];
        if(i+dy<=50000&&ysf[i-1]+yin[i+dy+1]<my)my=ysf[i-1]+yin[i+dy+1];
    }
    printf("%d\n",mx+my);
    return 0;
}