1 #include <stdio.h>
 2 #include <string.h>
 3 
 4 #define MAXNUM 1005
 5 
 6 char map[MAXNUM][MAXNUM];
 7 char visit[MAXNUM];
 8 int son[MAXNUM];
 9 
10 int find(int x, int m) {
11     int i;
12 
13     for (i=0; i<m; ++i) {
14         if (!visit[i] && map[x][i]) {
15             visit[i] = 1;
16             if (!son[i] || find(son[i], m)) {
17                 son[i] = x;
18                 return 1;
19             }
20         }
21     }
22 
23     return 0;
24 }
25 
26 int main() {
27     int n, m, k;
28     int i, j;
29 
30     while (scanf("%d", &n)!=EOF && n) {
31         scanf("%d %d", &m, &k);
32         memset(map, 0, sizeof(map));
33         while (k--) {
34             scanf("%*d %d %d", &i, &j);
35             if (i && j)
36                 map[i][j] = 1;
37         }
38         k = 0;
39         memset(son, 0, sizeof(son));
40         for (i=0; i<n; ++i) {
41             memset(visit, 0, sizeof(visit));
42             if (find(i, m))
43                 ++k;
44         }
45         printf("%d\n", k);
46     }
47  
48     return 0;
49 }