#include<cstdio>
int fx[50005],fy[50005];
int main()
{
    freopen("tribute.in","r",stdin);
    freopen("tribute.out","w",stdout);
    int n,dx,dy,i,x,y,d,minx=2000000000,miny=2000000000,maxx=0,maxy=0,distx=2000000000,disty=2000000000;
    scanf("%d%d%d",&n,&dx,&dy);
    for(i=1;i<=n;i++)
        {
        scanf("%d%d",&x,&y);
        fx[x]++;
        fy[y]++;
        if (x<minx)
            minx=x;
        if (x>maxx)
            maxx=x;
        if (y<miny)
            miny=y;
        if (y>maxy)
            maxy=y;
        }
    d=minx;
    int ina=0,dup=0,dist=0;
    for(i=minx+dx+1;i<=maxx;i++)
        dup=dup+fx[i],dist=dist+fx[i]*(i-minx-dx);
    for(;d<=maxx-dx;d++)
        {
        if (dist<distx)
            distx=dist;
        ina=ina+fx[d];
        dist=dist+ina;
        dist=dist-dup;
        dup=dup-fx[d+dx+1];
        }
    if (distx==2000000000)
        distx=0;
    d=miny;
    ina=0,dup=0,dist=0;
    for(i=miny+dy+1;i<=maxy;i++)
        dup=dup+fy[i],dist=dist+fy[i]*(i-miny-dy);
    for(;d<=maxy-dy;d++)
        {
        if (dist<disty)
            disty=dist;
        ina=ina+fy[d];
        dist=dist+ina;
        dist=dist-dup;
        dup=dup-fy[d+dy+1];
        }
    if (disty==2000000000)
        disty=0;
    printf("%d\n",distx+disty);
return 0;
}