#include <bits/stdc++.h>
#define MAX_V 10000
using namespace std;
int V;                //????????°
vector<int> G[MAX_V]; //??°???????????£??\???????????¨???
int match[MAX_V];     //??????????????°????????¢
bool used[MAX_V];     //DFS??§?????§??????????????????????????°

//u??¨v????????¶????????°?????????????????????
void add_edge(int u,int v){
  G[u].push_back(v);
  G[v].push_back(u);
}

//?¢?????????????DFS??§??¢???
bool dfs(int v){
  used[v] = true;
  for(int i=0; i<G[v].size(); i++){
    int u = G[v][i], w = match[u];
    if(w<0 || !used[w] && dfs(w)){
      match[v] = u;
      match[u] = v;
      return true;
    }
  }
  return false;
}

//?????¨??°??????????????§??????????????°????±???????
int bipartite_matching(){
  int res=0;
  memset(match, -1, sizeof(match));
  for(int v=0; v<V; v++){
    if(match[v] < 0){
      memset(used,0,sizeof(used));
      if(dfs(v)) res++;
    }
  }
  return res;
}


int main(){
  int n,m,l;
  cin>>n>>m>>l;
  for(int i=0,a,b;i<l;i++)cin>>a>>b,add_edge(a,n+b);
  V=n+m+2;
  cout <<bipartite_matching()<<endl;
}