#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int GCD(int x, int y){
    if(x>y){
        int swap = x;
        x = y;
        y = swap;
    }
    while(true){
        if(y%x==0){
            return x;
        }else{
            int amari = y%x;
            y = x;
            x = amari;
        }
    }
}

int main() {
    int p,q;
    cin >> p >> q;
    int g;
    if(p == 0 || q == 0){
        g = max(p, q);
    }else{
        g = GCD(p, q);
    }

    int n;
    cin >> n;
    int ans = 0;

    rep(i,n){
        int x, y;
        cin >> x >> y;
        x = abs(x);
        y = abs(y);
        if(x % g == 0 && y % g == 0)ans++;
    }

    cout << ans << endl;
    return 0;
}