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// Implementacja algorytmu Hopcrofta Karpa na podstawie ksiazki Algorytmika Praktyczna

#include <cstdio>
#include <algorithm>
#include <vector>

using namespace std;

typedef vector<int> VI;
typedef long long LL;

#define FOR(x, b, e) for(int x = b; x <= (e); ++x)
#define FORD(x, b, e) for(int x = b; x >= (e); --x)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define VAR(v, n) __typeof(n) v = (n)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
#define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define PB push_back
#define ST first
#define ND second
template<class V, class E> struct Graph {
	struct Ed : E {
		int v; 
		Ed(E p, int w) : E(p), v(w) {}
	};
	struct Ve : V,vector<Ed> {};
	vector<Ve> g;
	Graph(int n=0) : g(n) {}
	void EdgeD(int b, int e, E d = E()) {g[b].PB(Ed(d,e));}
  int topo;
  void TopoDfs(int v){
	  if (!g[v].t) {
		g[v].t=1; 
		FOREACH(it,g[v]) TopoDfs(it->v);
		g[v].t=--topo;
	  }
  }
  void TopoSort(){
    FOREACH(it,g) it->t=0; topo=SIZE(g);
	FORD(x,topo-1,0) TopoDfs(x);
  }
  VI TopoSortV(){
    VI res(SIZE(g));
    TopoSort();
    REP(x,SIZE(g)) res[g[x].t] = x;
    return res;
  }
  void Bfs(int s) {
	FOREACH(it, g) it->t=it->s=-1; g[s].t=0;
	int qu[SIZE(g)],b,e;
    qu[b=e=0]=s;
    while(b<=e) {
      s=qu[b++];
      FOREACH(it, g[s]) if (g[it->v].t==-1) {
        g[qu[++e]=it->v].t=g[s].t+1;
		g[it->v].s=s;
      }
    }
  }
  void mvFlow(int v, Ed &e){
    int u=e.v;
    g[u].PB(e); g[u].back().v=v;
    swap(g[v].back(),e); g[v].pop_back();
  }
  int Ue;
  bool UFDfs(int v){
    if (v==Ue) return true;
    g[v].s=1;
    FOREACH(it,g[v])
      if (g[it->v].t==1+g[v].t && !g[it->v].s && UFDfs(it->v)){
        mvFlow(v,*it); return true;
    }
    return false;
  }
  int UnitFlow(int v1,int v2){
    int res=0; Ue=v2;
    while (1){
      Bfs(v1);
      if (g[v2].t==-1) break;
      FOREACH(it,g) it->s=0;
      FOREACH(it,g[v1]) if (UFDfs(it->v)) {res++; mvFlow(v1, *it--);}
    }
    return res;
  }
  VI Hopcroft(){
    int n=SIZE(g); 
	VI res(n,-1);
	vector<char> l;
	if (!BiPart(l)) return res;
	g.resize(n+2);
	REP(i,n) if (!l[i]) EdgeD(n,i); else EdgeD(i,n+1);
	
	UnitFlow(n,n+1);
	REP(i,n) if (l[i] && g[i][0].v!=n+1)
		res[ res[g[i][0].v]=i ]=g[i][0].v;
    return res;
  }
bool BiPart(vector<char> &v) {
	v.resize(SIZE(g),2);
	VI r = TopoSortV();
	FOREACH(x, r) {
		if(v[*x]==2) v[*x]=0;
		FOREACH(it, g[*x]) if (v[it->v]==2)
				v[it->v] = 1-v[*x];
			else if (v[it->v] == v[*x])
				return 0;
	}
	return 1;
}
};
struct Ve {};
struct Vs {int t, s;};

int tab_rows[2002][2002];

void first_query(int n)
{
	Graph<Vs, Ve> g(n * n);
	
	for (int i = 0; i < n; i++)
	{
	  for (int j = 0; j < n; j++)
	  {
	    if (tab_rows[i][j])
	    {
	      for (int k = 0; k < n; k++)
	      {
	        if (!tab_rows[i][k])
	        {
	          g.EdgeD(n * i + j, n * i + k);
          }
	        if (!tab_rows[k][j])
	        {
	          g.EdgeD(n * i + j, n * k + j);
          }
        }
      }
    }
  }
  
	VI res = g.Hopcroft();
	
	int ret = 0;
	REP(x, SIZE(res)) if (res[x] > x)
	{
	  ret++;
  }
  printf("%d\n", ret);
}

int main() 
{ 
	int n, m, q;
	scanf("%d %d %d", &n, &m, &q);
	
	for (int i = 0; i < m; i++)
	{
	  int row1, row2, col1, col2;
	  scanf("%d %d %d %d", &row1, &col1, &row2, &col2);
    --row1;
    --row2;
    --col1;
    --col2;
	  
	  for (int j = row1; j <= row2; j++)
	  {
	    tab_rows[j][col1]++;
	    tab_rows[j][col2 + 1]--;
    }
  }
  
  for (int i = 0; i < n; i++)
  {
    int pref = 0;
    int s = 0;
    for (int j = 0; j < n; j++)
    {
      pref += tab_rows[i][j];
      tab_rows[i][j] = pref % 2;
    }
  }

  first_query(n);
	
	for (int z = 0; z < q; z++)
	{
	  int query_row, query_col;
	  scanf("%d %d", &query_row, &query_col);
	  --query_row;
    --query_col;
	  
	  if (tab_rows[query_row][query_col])
	  {
	    tab_rows[query_row][query_col] = 0;
    }
    else
    {
	    tab_rows[query_row][query_col] = 1;
    }

  	Graph<Vs, Ve> g(n * n);
  	
  	for (int i = 0; i < n; i++)
  	{
  	  for (int j = 0; j < n; j++)
  	  {
  	    if (tab_rows[i][j])
  	    {
  	      for (int k = 0; k < n; k++)
  	      {
  	        if (!tab_rows[i][k])
  	        {
  	          g.EdgeD(n * i + j, n * i + k);
            }
  	        if (!tab_rows[k][j])
  	        {
  	          g.EdgeD(n * i + j, n * k + j);
            }
          }
        }
      }
    }

  	VI res = g.Hopcroft();
	
  	int ret =0;
  	REP(x, SIZE(res)) if (res[x] > x)
  	{
  	  ret++;
    }
	  printf("%d\n", ret);
  }
	
	return 0;
}