#include<stdio.h>
#include<string.h>
int adj_vex[501][501];
int match[501];
int flag[501];
int find(int v, int n)
{
int i;
for (i = 1; i <= n; i++)
{
if (adj_vex[v][i] == 1 && flag[i] == 0)
{
flag[i] = 1;
if (match[i] == 0 || find(match[i], n) == 1)
{
match[i] = v;
return 1;
}
}
}
return 0;
}
void main()
{
int k, m, n;
int i, j, male, female;
int count;
// freopen("input.txt", "r", stdin);
while (scanf("%d", &k) != EOF && k != 0)
{
scanf("%d%d", &m, &n);
for (i = 1; i <= m; i++)
{
for (j = 1; j <= n; j++)
{
adj_vex[i][j] = 0;
}
}
for (i = 1; i <= k; i++)
{
scanf("%d%d", &male, &female);
adj_vex[male][female] = 1;
}
count = 0;
memset(match, 0, (n + 1)*sizeof(int));
for (i = 1; i <= m; i++)
{
memset(flag, 0, (n + 1)*sizeof(int));
if (find(i, n) == 1)
count++;
}
printf("%d\n",count);
}
}