# include <fstream>
# define DIM 50010

using namespace std;
int x[DIM], y[DIM], val, nrx, nry, i, x1, y1, n, dx, dy, xs[DIM], ys[DIM], xd[DIM], yd[DIM], minim1, minim2, maxx, maxy, minx, miny;
int main()
{
    ifstream fin("tribute.in");
    ofstream fout("tribute.out");
    fin>>n>>dx>>dy;
    minim2=minim1=minx=miny=DIM;
    for(i=1;i<=n;i++){
        fin>>x1>>y1;
        x[x1]++;
        y[y1]++;
        if(x1>maxx)
            maxx=x1;
        if(y1>maxy)
            maxy=y1;
        if(x1<minx)
            minx=x1;
        if(y1<miny)
            miny=y1;

    }
    nrx=x[minx];
    xs[minx]=nrx;
    for(i=minx+1;i<=maxx;i++){
        xs[i]=xs[i-1]+nrx;
        if(x[i]!=0)
            nrx+=x[i];
    }
    nrx=x[maxx];
    xd[maxx]=nrx;
    for(i=maxx-1;i>=minx;i--){
        xd[i]=xd[i-1]+nrx;
        if(x[i]!=0)
            nrx+=x[i];
    }
    nry=y[miny];
    ys[miny]=nry;
    for(i=miny+1;i<=maxy;i++){
        ys[i]=ys[i-1]+nry;
        if(y[i]!=0)
            nry+=y[i];
    }
    nry=y[maxy];
    yd[miny]=nry;
    for(i=maxy-1;i>=miny;i--){
        yd[i]=yd[i-1]+nry;
        if(y[i]!=0)
            nry+=y[i];
    }
    for(i=minx;i<=maxx-dx+1;i++){
        val=xs[i]+xd[i+dx-1];
        if(val<minim1)
            minim1=val;

    }
    for(i=miny;i<=maxy-dy+1;i++){
        val=ys[i]+yd[i+dy-1];
        if(val<minim2)
            minim2=val;

    }
    fout<<minim1+minim2<<"\n";
    return 0;
}