#include <bits/stdc++.h>
using namespace std;
ifstream fin("pachete.in");
ofstream fout("pachete.out");
int n,x,y,px,py,i,sol,d[50010];
vector< pair<int,int> > c1,c2,c3,c4;
int cadran(vector< pair<int,int> > v) {
    if (v.size()==0)
        return 0;
    sort(v.begin(),v.end());
    int cnt=1,st,dr;
    d[1]=v[0].second;
    for (i=1;i<v.size();i++) {
        x=v[i].second;
        st=1, dr=cnt;
        while (st<=dr) {
            int mid=(st+dr)/2;
            if (d[mid]>x)
                st=mid+1;
            else
                dr=mid-1;
        }
        if (st>cnt)
            cnt++;
        d[st]=x;
    }
    return cnt;
}
int main() {
    fin>>n;
    fin>>x>>y;
    for (i=1;i<=n;i++) {
        fin>>px>>py;
        px-=x, py-=y;
        if (px>0) {
            if (py>0)
                c1.push_back({px,py});
            else
                c4.push_back({px,py});
        }
        else {
            if (py>0)
                c2.push_back({px,py});
            else
                c3.push_back({px,py});
        }
    }
    for (auto it:c2)
        it.first=-it.first;
    for (auto it:c3)
        it.first=-it.first, it.second=-it.second;
    for (auto it:c4)
        it.second=-it.second;
    sol=cadran(c1)+cadran(c2)+cadran(c3)+cadran(c4);
    fout<<sol;
    return 0;
}