#include <bits/stdc++.h>

using namespace std;
ifstream fin("pachete.in");
ofstream fout("pachete.out");
int n, cnt = 0, sol[50010], rez = 0;
vector<int> cadran1, cadran2, cadran3, cadran4;

struct pereche {
    ///cine stie cunoaste
    int x, y;
    void read() { fin >> x >> y; }
}v[50010];
pereche start;

inline int ecDreptei(int x, int y, int x1, int y1, int x2, int y2) {
    ///verifica daca (x, y) e pe dreapta care trece prin (x1, y1) si (x2, y2) cf ec dr
    return (((x - x1) * (y2 - y1)) == ((x2 - x1) * (y - y1)));
}

int main()
{
    fin >> n;
    start.read();
    for(int i=1; i<=n; i++) {
        v[i].read();
        if(v[i].x <= start.x && v[i].y >= start.y) cadran1.push_back(i);
        else if(v[i].x >= start.x && v[i].y >= start.y) cadran2.push_back(i);
        else if(v[i].x >= start.x && v[i].y <= start.y) cadran3.push_back(i);
        else cadran4.push_back(i);
    }
    for(int i : cadran1) {
        bool ok = false;
        for(int j=1; j<=cnt && !ok; j++)
            if(ecDreptei(v[i].x, v[i].y, start.x, start.y, v[sol[j]].x, v[sol[j]].y)) ok = true;
        if(!ok) sol[++cnt] = i;
    }
    rez += cnt, cnt = 0;
    for(int i : cadran2) {
        bool ok = false;
        for(int j=1; j<=cnt && !ok; j++)
            if(ecDreptei(v[i].x, v[i].y, start.x, start.y, v[sol[j]].x, v[sol[j]].y)) ok = true;
        if(!ok) sol[++cnt] = i;
    }
    rez += cnt, cnt = 0;
    for(int i : cadran3) {
        bool ok = false;
        for(int j=1; j<=cnt && !ok; j++)
            if(ecDreptei(v[i].x, v[i].y, start.x, start.y, v[sol[j]].x, v[sol[j]].y)) ok = true;
        if(!ok) sol[++cnt] = i;
    }
    rez += cnt, cnt = 0;
    for(int i : cadran4) {
        bool ok = false;
        for(int j=1; j<=cnt && !ok; j++)
            if(ecDreptei(v[i].x, v[i].y, start.x, start.y, v[sol[j]].x, v[sol[j]].y)) ok = true;
        if(!ok) sol[++cnt] = i;
    }
    rez += cnt, cnt = 0;
    fout << rez;

    return 0;
}