#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}


struct UnionFind{
  int n,num;
  vector<int> r,p;
  UnionFind(){}
  UnionFind(int sz):n(sz),num(sz),r(sz,1),p(sz,0){iota(p.begin(),p.end(),0);}
  int find(int x){
    return (x==p[x]?x:p[x]=find(p[x]));
  }
  bool same(int x,int y){
    return find(x)==find(y);
  }
  void unite(int x,int y){
    x=find(x);y=find(y);
    if(x==y) return;
    if(r[x]<r[y]) swap(x,y);
    r[x]+=r[y];
    p[y]=x;
    num--;
  }
  int size(int x){
    return r[find(x)];
  }
  int count() const{
    return num;
  }
};

//INSERT ABOVE HERE
signed main(){
  int a,b,c,d;
  cin>>a>>b>>c>>d;
  int n;
  cin>>n;
  vector<int> xs(n),ys(n);
  for(int i=0;i<n;i++) cin>>xs[i]>>ys[i];

  UnionFind uf(n);
  for(int i=0;i<n;i++){
    for(int j=0;j<i;j++){
      int x=xs[i]-xs[j];
      int y=ys[i]-ys[j];
      int p=(c*y-d*x)/(b*c-a*d);
      int q=(a*y-b*x)/(a*d-b*c);
      if(a*p+c*q==x&&b*p+d*q==y) uf.unite(i,j);
    }
  }
  cout<<uf.count()<<endl;
  return 0;
}