#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;}

//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];

  if(a*d-b*c==0){
    Int dx=__gcd(a,c);
    Int dy=__gcd(b,d);
    if(dx==0) dx=2e9;
    if(dy==0) dy=2e9;

    using P = pair<Int, Int>;
    set<P> sp;
    for(Int i=0;i<n;i++)
      sp.emplace(xs[i]%dx,(xs[i]+ys[i])%(dx+dy));

    cout<<sp.size()<<endl;
    return 0;
  }

  Int m=abs(a*d-b*c);
  using P = pair<Int, Int>;
  set<P> sp;
  for(Int i=0;i<n;i++)
    sp.emplace(((+d*xs[i]-c*ys[i])%m+m)%m,
               ((-b*xs[i]+a*ys[i])%m+m)%m);

  cout<<sp.size()<<endl;
  return 0;
}