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#include <bits/stdc++.h>
using namespace std;
const int N = 510;
const int M = 100010;
int n1, n2;
int m;
int match[N];
int st[N];
int res;
int h[N], e[M], ne[M], idx;
void add(int a, int b) {
e[idx] = b, ne[idx] = h[a], h[a] = idx++;
}
int dfs(int u) {
for (int i = h[u]; ~i; i = ne[i]) {
int v = e[i];
if (!st[v]) {
st[v] = 1;
if (match[v] == 0 || dfs(match[v])) {
match[v] = u;
return 1;
}
}
}
return 0;
}
int main() {
memset(h, -1, sizeof h);
cin >> n1 >> n2 >> m;
while (m--) {
int a, b;
cin >> a >> b;
add(a, b);
}
for (int i = 1; i <= n1; i++) {
memset(st, 0, sizeof st);
if (dfs(i)) res++;
}
printf("%d\n", res);
return 0;
}