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#include <bits/stdc++.h>

using namespace std;

struct e{
	int a, flow, cap;
};

vector<e> edges;
vector<vector<int>> graf;
vector<int> cost, nast;
int s, t;

void addEdge(int a, int b, int c){
	e e1 = {b, 0, c};
	graf[a].push_back(edges.size());
	edges.push_back(e1);
	e e2 = {a, 0, 0};	
	graf[b].push_back(edges.size());
	edges.push_back(e2);
}

void resetDinic(){
	for(int i = 0; i < edges.size(); i++){
		edges[i].flow = 0;	
	}	
}

bool bfs(){
	queue<int> q;
	q.push(s);
	cost.resize(0);
	cost.resize(t+1, 1e9);
	cost[s] = 0;
	
	while(q.size()){
		int cur = q.front();
		q.pop();
		for(auto i:graf[cur]){
			e it = edges[i];
			if((it.flow<it.cap)&&cost[it.a]==1e9){
				q.push(it.a);
				cost[it.a] = cost[cur]+1;	
			}	
		}	
	}	
	
	return cost[t]!=1e9;
}

int dfs(int x, int limit){
	if(limit==0) return -1;
	if(x==t){
		return limit;	
	}	
	for(int i = nast[x]; nast[x]<graf[x].size(); nast[x]++){
		i = nast[x];	
		int id = graf[x][i];
		e cur = edges[id];
		int a = cur.a;
		if(cost[x]+1==cost[a]){
			int tmp = dfs(a, min(limit, cur.cap-cur.flow));
			if(tmp!=-1){
				edges[id].flow+=tmp;
				edges[id^1].flow-=tmp;
				return tmp;	
			}
		}
	}
	return -1;
}

int dinic(){
	resetDinic();
	int out = 0;
	while(bfs()){
		nast.resize(0);
		nast.resize(t+1, 0);
		int tmp = 0;	
		while(tmp!=-1){
			out+=tmp;
			tmp = dfs(s, 1e9);
		}
	}	
	return out;
}

int main(){
	ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr);
	int n, m, q; cin>>n>>m>>q;
	s=n*n+1;
	t=n*n+2;
	graf.resize(t+1);
	vector<vector<int>> pref(n, vector<int>(n));
	vector<vector<int>> tab(n, vector<int>(n));

	for(int i = 0; i < m; i++){
		int a, b, c, d;	
		cin>>a>>b>>c>>d;
		a--; b--; c--; d--;
		pref[a][b]++;
		if(c<n-1) pref[c+1][b]--;
		if(d<n-1) pref[a][d+1]--;
		if(c<n-1&&d<n-1) pref[c+1][d+1]++;	
	}
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			tab[i][j] = pref[i][j];
			if(i>0) tab[i][j] += tab[i-1][j];	
			if(j>0) tab[i][j] += tab[i][j-1];	
			if(i>0&&j>0) tab[i][j] -= tab[i-1][j-1];
		}	
	}
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			int cur = i*n+j;
			if(tab[i][j]%2){
				addEdge(s, cur, 1);	
				for(int k = 0; k < n; k++){
					if(k!=i) if(tab[k][j]%2==0) addEdge(cur, k*n+j, 1);	
					if(k!=j) if(tab[i][k]%2==0) addEdge(cur, i*n+k, 1);	
				}
			}else{
				addEdge(cur, t, 1);	
			}	
		}	
	}
	cout<<dinic()<<'\n';
	for(int i = 0; i < q; i++){
		int a, b; cin>>a>>b; 
		a--; b--;
		tab[a][b]++;			
		graf.resize(0);
		edges.resize(0);
		graf.resize(t+1);
		for(int i = 0; i < n; i++){
			for(int j = 0; j < n; j++){
				int cur = i*n+j;
				if(tab[i][j]%2){
					addEdge(s, cur, 1);	
					for(int k = 0; k < n; k++){
						if(k!=i) if(tab[k][j]%2==0) addEdge(cur, k*n+j, 1);	
						if(k!=j) if(tab[i][k]%2==0) addEdge(cur, i*n+k, 1);	
					}
				}else{
					addEdge(cur, t, 1);	
				}	
			}	
		}
		cout<<dinic()<<'\n';
	}
	return 0;
}