#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<iostream>
#include<algorithm>
#define N 1500+10
using namespace std;
bool vis[N];
int n,m,k,x,y,girl[N],map[N][N];
int read()
{
    int x=0,f=1; char ch=getchar();
    while(ch<‘0‘||ch>‘9‘){if(ch==‘-‘)f=-1; ch=getchar();}
    while(ch>=‘0‘&&ch<=‘9‘){x=x*10+ch-‘0‘; ch=getchar();}
    return x*f;
}
int find(int x)
{
    for(int i=1;i<=m;i++)
    {
        if(!vis[i]&&map[x][i])
        {
            vis[i]=true;
            if(girl[i]==-1||find(girl[i])) {girl[i]=x;return 1;}
        }
    }
    return 0;
}
int main()
{
    int t=0,sum,ans;
    while(1)
    {
        k=read();if(k==0) break;
        n=read(),m=read(),ans=0;
        memset(map,0,sizeof(map));
        for(int i=1;i<=k;i++)
          x=read(),y=read(),map[x][y]=1; 
        memset(girl,-1,sizeof(girl));
        for(int i=1;i<=n;i++)
        {
            memset(vis,0,sizeof(vis));
            if(find(i)) ans++;
        }
        printf("%d\n",ans);
    }
    return 0;
}