#include <bits/stdc++.h>
using namespace std;
#define lb lower_bound
#define ff first
#define ss second
typedef long long ll;
typedef pair<ll, ll> pll;
const int maxn = 1e5 + 7;
ll n, m, a[maxn], r[maxn], ps[maxn];
pll o[maxn], b[maxn], pv, c1;
bool in[maxn];
set<int> fr;
ll ccw(pll a, pll b, pll c){
return a.ff * (b.ss - c.ss) + b.ff * (c.ss - a.ss) + c.ff * (a.ss - b.ss);
}
bool comp(pll a, pll b){
if ((a.ss >= pv.ss) != (b.ss >= pv.ss))
return (a.ss > b.ss);
ll f = ccw(pv, a, b);
if (f != 0) return (f > 0);
if ((a.ff > pv.ff) != (b.ff > pv.ff))
return (a.ff > b.ff);
return (a.ff < b.ff);
}
bool insi(int l1, int r1, int gr){
if ((l1 <= gr && gr <= r1) || (l1 <= (gr + m) && (gr + m) <= r1))
return 1;
return 0;
}
bool inters(int l1, int r1, int l2, int r2){
if (insi(l1, r1, l2) || insi(l1, r1, r2))
return 1;
return 0;
}
int main(){
// ios_base::sync_with_stdio(0);
// cin.tie(0); cout.tie(0);
cin >> n;
ll sx = 0, sy = 0;
for (int i = 0; i < n; i++){
a[i] = r[i] = -1;
cin >> b[i].ff >> b[i].ss;
sx += b[i].ff, sy += b[i].ss;
}
sx /= n, sy /= n;
c1 = b[0];
cin >> m;
for (int i = 0; i < m; i++){
fr.insert(i);
fr.insert(i + m);
cin >> o[i].ff >> o[i].ss;
}
pv = {sx, sy};
sort(b, b + n, comp);
int trs, le = 0, ri = 1;
for (int i = 0; i < m; i++){
if (ccw(b[0], o[(i + 1) % m], o[i]) >= 0){
trs = i;
break;
}
}
while(ri != le){
if (ccw(b[ri], o[(trs + 1) % m], o[trs]) < 0)
break;
in[ri] = 1;
a[ri] = trs;
ri = (ri + 1) % n;
}
while(le != ri){
if (ccw(b[le], o[(trs + 1) % m], o[trs]) < 0){
le = (le + 1) % n;
break;
}
in[le] = 1;
a[le] = trs;
le = (le + n - 1) % n;
}
for (int i = (trs + 1) % m; i != trs; i = (i + 1) % m){
while(le != ri){
if (ccw(b[le], o[(i + 1) % m], o[i]) >= 0)
break;
r[le] = i;
le = (le + 1) % n;
}
if (le == ri){
a[ri] = i;
ri = (ri + 1) % n;
}
while(ri != le){
if (ccw(b[ri], o[(i + 1) % m], o[i]) < 0)
break;
a[ri] = i;
ri = (ri + 1) % n;
}
}
for (int i = 0; i < n; i++){
if (r[i] == -1)
r[i] = trs;
r[i] = (r[i] + m - 1) % m;
if (r[i] < a[i])
r[i] += m;
}
int ind;
for (int i = 0; i < n; i++)
if (b[i] == c1)
ind = i;
for (int i = 0; i < n; i++){
if (!inters(a[i], r[i], a[ind], r[ind])) continue;
while(!fr.empty() && fr.lb(a[i]) != fr.end() && *fr.lb(a[i]) <= r[i]){
int lbb = *fr.lb(a[i]) % m;
fr.erase(fr.find(lbb));
fr.erase(fr.find(lbb + m));
ps[lbb] = 1;
}
}
for (int i = 1; i < m; i++)
ps[i] += ps[i - 1];
int ans = -1;
for (int i = 0; i < n; i++){
int uk = ps[r[i] % m];
if (a[i] > 0) uk -= ps[a[i] - 1];
if (uk < 0) uk += ps[m - 1];
ans += (uk > 0);
}
cout << ans << "\n";
return 0;
}
