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#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4")
typedef long long LL;

// JA CHCE JUZ ISC SPAC!!
// ZMECZONY :(


map<pair<int, int>, int> mapa; //wspolrzedne; id
vector<pair<int, int>> klocki; //klocek o id=i ma wspolrzedne PII
int liczba_klockow[200009]; //liczba klockow w momencie k
int stan[200009]; // czym jest kazdy klocek; 1=wolny; 2=kwadrat; 3=trojkat;

const vector<pair<int, int>> mo = {{-1, -1}, {-1, 0}, {-1, 1}, {0, 1}, {1, 1}, {1, 0}, {1, -1}, {0, -1}};
const vector<vector<int>> kwadrat_trio = {{0, 1, 7}, {1, 2, 3}, {3, 4, 5}, {5, 6, 7}};
const vector<vector<int>> trojkat_duo = {{1, 7}, {1, 3}, {3, 5}, {5, 7}};
const vector<int> szlaczek = {1, 3, 5, 7};


//dla q=1;


struct dsu {
	int parent, size;
	int x;
} d[200009];

int find(int a) {
	if (d[a].parent == a) {
		return a;
	}
	d[a].parent = find(d[a].parent);
	return d[a].parent;
}
 
void unite(int a, int b) {
	int A = find(a);
	int B = find(b);
	if (A == B) return;
	if (d[A].size > d[B].size) {
		d[B].parent = A;
		d[A].size += d[B].size;
		d[A].x |= d[B].x;
	} else {
		d[A].parent = B;
		d[B].size += d[A].size;
		d[B].x |= d[A].x;
	}
}
 
void makeset(int a) {
	d[a].parent = a;
	d[a].size = 1;
	d[a].x = 0;
}

void qq(){
	
		
	for(unsigned i=0; i<=klocki.size(); i++){
		makeset(i);
	}
	
	
	map<pair<int, int>, int> kwadraty;
	map<pair<int, int>, int> trojkaty;
	
	for(auto [p, id] : mapa){
		
		//sprawdz sasiadow
		vector<int> v(8);
		for(int i=0; i<8; i++){
			pair<int, int> punkt = {p.first + mo[i].first, p.second + mo[i].second};
			if(mapa.find(punkt) != mapa.end()){
				v[i] = mapa[punkt];
			}
		}

		//kwadrat
		for(auto kw : kwadrat_trio){
			if(v[kw[0]] && v[kw[1]] && v[kw[2]]){
				stan[id] = 2;
				/*for(auto x : kw){
					stan[v[x]] = 2;
				}*/
				kwadraty[p] = id;
			}
		}
		
		//trojkat
		if(stan[id] != 2){
			for(auto tr : trojkat_duo){
				if(v[tr[0]] && v[tr[1]]){
					if(stan[id] != 2){
						stan[id] = 3;
						trojkaty[p] = id;
					}
					for(auto x : tr){
						if(stan[v[x]] == 3){
							unite(id, v[x]);
						}
					}
				}
			}
		}
	}
	
	//vector<bool> odw(klocki.size()+1);
	
	for(auto [p, id] : trojkaty){
		//sprawdz sasiadow
		vector<int> v(8);
		for(int i=0; i<8; i++){
			pair<int, int> punkt = {p.first + mo[i].first, p.second + mo[i].second};
			if(mapa.find(punkt) != mapa.end()){
				v[i] = mapa[punkt];
			}
		}
		
		//czy szlaczek
		for(auto sz : szlaczek){
			if(v[sz] != 0 && (stan[v[sz]] == 0 || stan[v[sz]] == 1)){
				d[find(id)].x |= 0b10000;
			}
		}
		
		//jesli trojkat sasiaduje z kwadratem
		
		if(stan[id]==3){
			if(stan[v[1]]==2 && (stan[v[3]] == 2 || stan[v[3]] == 3)) d[find(id)].x |= 0b0001;
			if(stan[v[1]]==2 && (stan[v[7]] == 2 || stan[v[7]] == 3)) d[find(id)].x |= 0b0010;
			if(stan[v[5]]==2 && (stan[v[7]] == 2 || stan[v[7]] == 3)) d[find(id)].x |= 0b0100;
			if(stan[v[5]]==2 && (stan[v[3]] == 2 || stan[v[3]] == 3)) d[find(id)].x |= 0b1000;
			
			if(stan[v[7]]==2 && (stan[v[5]] == 2 || stan[v[5]] == 3)) d[find(id)].x |= 0b0001;
			if(stan[v[3]]==2 && (stan[v[5]] == 2 || stan[v[5]] == 3)) d[find(id)].x |= 0b0010;
			if(stan[v[3]]==2 && (stan[v[1]] == 2 || stan[v[1]] == 3)) d[find(id)].x |= 0b0100;
			if(stan[v[7]]==2 && (stan[v[1]] == 2 || stan[v[1]] == 3)) d[find(id)].x |= 0b1000;
			
		}
		
	}
	
	int res = liczba_klockow[0] - kwadraty.size();
	
	for(int kl=0; kl<=(int)klocki.size(); kl++){
		if(stan[kl] == 3){
			if(find(kl) == kl){
				if((d[kl].x & 0b10000) == 0b10000)continue;
				if((d[kl].x & 0b0101) == 0b0101 || (d[kl].x & 0b1010) == 0b1010){
					res -= d[kl].size;
				}
			}
		}
	}
	
	cout<<res<<"\n";
	
	
	/*for(int x=1; x<=20; x++){
		for(int y=1; y<=20; y++){
			if(mapa.find({x, y}) != mapa.end()){
				int id = mapa[{x, y}];
				bool tr = (d[find(id)].x & 0b0101) == 0b0101 || (d[find(id)].x & 0b1010) == 0b1010;
				if(stan[id]==2 || tr)
					cout<<"X";
				else cout<<"O";
			}else{
				cout<<".";
			}
		}
		cout<<"\n";
	}*/
	
	
	// TODO
	// clear dsu
	// clear stan;
	
	for(int kl=0; kl<=(int)klocki.size(); kl++){
		stan[kl] = 0;
	}
}


void q1(int q){
	qq();
	for(int i=1; i<=q; i++){
		pair<int, int> punkt;
		cin>>punkt.first>>punkt.second;
		if(mapa.find(punkt) == mapa.end()){
			int id = klocki.size();
			mapa[punkt] = id;
			klocki.push_back(punkt);
			liczba_klockow[0]++;		
		}else{
			//int id = mapa[punkt];
			mapa.erase(punkt);
			liczba_klockow[0]--;	
		}
		
		qq();
		/*if(i==30657-1){
			qq();
			//for(auto [p, id] : mapa){
			//	cout<<p.first<<" "<<p.second<<"\n";
			//}
			
			return;
		}*/
	}
}



//dla q > 1

class DSUWithRollback {
public:
	DSUWithRollback(int n) {
		parent.resize(n + 1);
		rank.resize(n + 1);
		for (int i = 0; i <= n; i++) {
			parent[i] = i;
			rank[i] = 1;
		}
		comp = n;
	}
	int find(int x) {
		if (x == parent[x]) {
			return x;
		}
		return find(parent[x]);
	}
	bool unite(int a, int b) {
		a = find(a);
		b = find(b);
		if (a == b) return false;
		if (rank[a] < rank[b]) swap(a, b);
		s.push(DSU(a, b, parent[b], rank[a]));
		parent[b] = parent[a];
		rank[a] += rank[b];
		comp--;
		return true;
	}
	void rollback() {
		auto dsu = s.top();
		s.pop();
		comp++;
		parent[dsu.b] = dsu.parent;
		rank[dsu.a] = dsu.rank;
	}
	int components() {
		return this->comp;
	}
	int size() {
		return s.size();
	}

private:
	vector<int> parent;
	vector<int> rank;
	int comp;
	struct DSU {
		int a, b, parent, rank;
		DSU(int a, int b, int parent, int rank) : a(a), b(b), parent(parent), rank(rank) {}
	};
	stack<DSU> s;
};

class DynamicConnectivity {
public:
	DynamicConnectivity(int n, int k) : dsu(DSUWithRollback(n)) {
		t.resize(4 * k + 9); //zwiekszyc??
		ans.resize(k + 1);
	}
	void add(int b, int e, int u, int v, int l, int r, int st) {
		if (l <= b && r >= e) {
			t[st].push_back(Q(u, v));
			return;
		}
		int mid = (b + e) / 2;
		if (l <= mid) add(b, mid, u, v, l, r, st * 2);
		if (r >= mid + 1) add(mid + 1, e, u, v, l, r, st * 2 + 1);
	}
	void solve(int b, int e, int st = 1) {
		int cnt = 0;
		for (auto &q : t[st]) {
			if (dsu.unite(q.u, q.v)) {
				cnt++;
			}
		}
		if (b == e) {
			ans[b] = dsu.components();
		} else {
			int mid = (b + e) / 2;
			solve(b, mid, st * 2);
			solve(mid + 1, e, st * 2 + 1);
		}
		while (cnt--) {
			dsu.rollback();
		}
	}
	vector<int> answer() {
		return ans;
	}

private:
	DSUWithRollback dsu;
	struct Q {
		int u, v;
		Q(int u = 0, int v = 0) : u(u), v(v) {}
	};
	vector<vector<Q>> t;
	vector<int> ans;
};



void aktualizuj(bool dodano, pair<int, int> p, int k, int id){
	//sprawdz sasiadow
	vector<int> v(8);
	for(int i=0; i<8; i++){
		pair<int, int> punkt = {p.first + mo[i].first, p.second + mo[i].second};
		if(mapa.find(punkt) != mapa.end()){
			v[i] = mapa[punkt];
		}
	}
	
	if(dodano){
		//kwadrat
		for(auto kw : kwadrat_trio){
			if(v[kw[0]] && v[kw[1]] && v[kw[2]]){
				stan[id] = 2;
				
			}
		}
	}
	
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int NN, MM, KK, q;
	cin>>NN>>MM>>KK>>q;
	int lk = KK;
	
	DynamicConnectivity dc(KK+q, q);
	klocki.push_back({-1, -1}); // indeksujemy od 1
	
	for(int i=0; i<KK; i++){
		int a, b;
		cin>>a>>b;
		int id = klocki.size();
		mapa[{a, b}] = id;
		klocki.push_back({a, b});
		//if(q > 1) aktualizuj(true, {a, b}, 0, id); //tutaj if dla q==1
	}
	liczba_klockow[0] = lk;
	
	if(true){ //q==1
		q1(q);
		return 0;
	}
	
	for(int i=1; i<=q; i++){
		int a, b;
		cin>>a>>b;
		if(mapa.find({a, b}) == mapa.end()){
			int id = klocki.size();
			mapa[{a, b}] = id;
			klocki.push_back({a, b});
			lk++;
			liczba_klockow[i] = lk;
			aktualizuj(true, {a, b}, i, id);
			
		}else{
			int id = mapa[{a, b}];
			mapa.erase({a, b});
			lk--;
			liczba_klockow[i] = lk;
			aktualizuj(false, {a, b}, i, id);
			
		}
	}
	
	dc.solve(0, q + 1);
	auto ans = dc.answer();
	
	/*for (auto &v : g) {
		for (auto [l, r] : v.second) {
			dc.add(0, k + 1, v.first.first, v.first.second, l, r - 1, 1);
		}
	}
	dc.solve(0, k + 1);
	auto ans = dc.answer();
	for (int i = 0; i <= k; i++) {
		cout << ans[i] << " ";
	}
	cout << "\n";*/
	return 0;
}