#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#define popcount __builtin_popcount
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> P;
ll gcd(ll a, ll b){
    if(b==0) return a;
    return gcd(b, a%b);
}
ll lcm(ll a, ll b){
    return a/gcd(a, b)*b;
}
void extgcd(ll& a, ll& b, ll& c, ll& d){
	if(c==0) return;
	ll q=a/c;
	a-=c*q, b-=d*q;
	swap(a, c), swap(b, d);
	extgcd(a, b, c, d);
}
ll a, b, c, d;
int solve(){
    extgcd(a, b, c, d);
    b%=d;
    int n; cin>>n;
    set<P> st;
    for(int i=0; i<n; i++){
        ll x, y; cin>>x>>y;
        ll q=x/a;
        x-=q*a, y-=q*b;
        y=(y%d+d)%d;
        st.insert(P(x, y));
    }
    return st.size();
}
int solve0(){
    ll g1=gcd(a, c), g2=gcd(b, d);
    ll s=lcm(a/g1, b/g2);
    ll p=a/s, q=b/s;
    int n; cin>>n;
    set<P> st;
    for(int i=0; i<n; i++){
        ll x, y; cin>>x>>y;
        if(p==0){
            ll t=y/q;
            x-=t*p, y-=t*q;
            st.insert(P(x, y));
        }else{
            ll t=x/p;
            x-=t*p, y-=t*q;
            st.insert(P(x, y));
        }
    }
    return st.size();
}
int main()
{
    cin>>a>>b>>c>>d;
    if(a*d-b*c==0){
        cout<<solve0()<<endl;
    }else{
        cout<<solve()<<endl;
    }
    return 0;
}