#include <bits/stdc++.h>
using namespace std;
ifstream f ("cuplaj.in");
ofstream g ("cuplaj.out");
const int nmax=1e4+3;
vector <int> v[nmax];
int dr[nmax],st[nmax],t,n,m,e,sol,a,b,ok;
bool viz[nmax];
inline bool cuplaj(int nod)
{
    if(viz[nod]) return 0;
    viz[nod]=1;
    for(int i=0;i<v[nod].size();++i)
    {
        if(!dr[v[nod][i]]||cuplaj(dr[v[nod][i]]))
        {
            dr[v[nod][i]]=nod;
            st[nod]=v[nod][i];
            return 1;
        }
    }
    return 0;
}
int main()
{
    ios::sync_with_stdio(false);
    //f>>t;
    t=1;
    while(t--)
    {
        f>>n>>m>>e;
        memset(st,0,sizeof(st));
        memset(dr,0,sizeof(dr));
        for(int i=1;i<=n;++i) v[i].clear();
        sol=0;
        while(e--)
        {
            f>>a>>b;
            v[a].push_back(b);
        }
        ok=1;
        while(ok)
        {
            memset(viz,0,sizeof(viz));
            ok=0;
            for(int i=1;i<=n;++i) if(cuplaj(i)) ok=1;
        }
        for(int i=1;i<=n;++i) if(st[i]) ++sol;
        g<<sol<<'\n';
    }
    return 0;
}