#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <math.h>
#include <limits.h>
#define Max(a, b) ((a) > (b) ? (a) : (b))
#define Min(a, b) ((a) > (b) ? (b) : (a))
#define abs(x) ((x) > 0 ? (x) : -(x))
#define rep(i, n) for(int i = 0; i < (n); i++)
#define INF 1000000000000 //10^12
#define MOD 1000000007 //10^9 + 7
#define endl printf("\n")
typedef long long ll;

typedef struct { ll x, y; } R;

//b > 0とする
ll
rem(ll a, ll b)
{
  if (a < 0 && a % b < 0) return a % b + b;
  if (b == 0) return a;
  return a % b;
}

ll
gcd(ll a, ll b)
{
  if (a == 0 || b == 0) return a + b;
  if (a < b) return gcd(b, a);
  return gcd(b, a % b);
}

int
Rsort(const void *a, const void *b)
{
  R A = *(R *)a, B = *(R *)b;
  if (A.x == B.x && A.y == B.y) return  0;
  if (A.x < B.x) return -1;
  if (A.x > B.x) return  1;
  if (A.y < B.y) return -1;
  return 1;
}

int
main(int argc, char **argv)
{
  
  ll a, b, c, d;
  scanf("%lld %lld %lld %lld", &a, &b, &c, &d);
  
  int n;
  scanf("%d", &n);
  
  if (a * d - b * c != 0) {
    ll p = abs(a * d - b * c);
    ll x, y;
    R r[100010];
    for (int i = 0; i < n; i++) {
      scanf("%lld %lld", &x, &y);
      r[i].x = rem(d * x - c * y, p);
      r[i].y = rem(a * y - b * x, p);
    }
    

    qsort(r, n, sizeof(R), Rsort);
    
    int cnt = 1;
    for (int i = 0; i < n - 1; i++) {
      if (r[i].x != r[i + 1].x || r[i].y != r[i + 1].y) cnt++;
    }

    printf("%d\n", cnt);
    
  } else {
    ll dv, dv2; ll s, t, p, q;
    if (a != 0) {
      dv = gcd(a, c);
      s = abs(a / dv);
      t = abs(c / dv);
      p = dv; q = b / (a / dv);
    } else {
      dv = gcd(b, d);
      s = abs(b / dv);
      t = abs(d / dv);
      p = a / (b / dv); q = dv;
    }

    
    ll x, y; R r[100010]; ll o;
    for (int i = 0; i < n; i++) {
      scanf("%lld %lld", &x, &y);
      r[i].x = rem(x, p);
      o = (x - rem(x, p)) / p;
      r[i].y = y - q * o;
    }

    qsort(r, n, sizeof(R), Rsort);

    int cnt = 1;
    for (int i = 0; i < n - 1; i++) {
      if(r[i].x != r[i + 1].x || r[i].y != r[i + 1].y){
	cnt++;
      }
    }

    printf("%d\n", cnt);
  }

  return 0;
}