1 #include <iostream>
 2 #include <stdio.h>
 3 #include <string.h>
 4 #include <cstring>
 5 #include<map>
 6 using namespace std;
 7 
 8 map<string,int>name;
 9 const int INF = 1000000;
10 const int MAXSIZE = 1005;
11 const int MAXN = 30;
12 double g[MAXN][MAXN];
13 
14 //dis[][]记录任意两点间的最短路径，初始的dis[][]记录直接路径
15 void floyed(double dis[][MAXN],int n){//节点从1~n编号
16     int i,j,k;
17     for(k = 1; k <= n; k++)
18        for(i = 1; i <= n; i++)
19          for(j = 1; j <= n; j++)
20              if(dis[i][j] < dis[i][k] * dis[k][j])
21                  dis[i][j] = dis[i][k] * dis[k][j];
22 }
23 int main(){
24     int n,i,m,j;
25     string str1,str2;
26     double r;
27     int iCase = 0;
28     while(scanf("%d",&n),n){
29         iCase++;
30         for(i = 1; i <= n; i++){
31             cin>>str1;
32             name[str1] = i;
33         }
34         for(i = 1; i <= n; i++)
35            for(j = 1; j <= n; j++){
36                if(i == j) g[i][j] = 1;
37                else g[i][j] = 0;
38            }
39         scanf("%d",&m);
40         while(m--){
41             cin>>str1>>r>>str2;
42             g[name[str1]][name[str2]] = r;
43         }
44         
45         floyed(g,n);
46         
47         bool flag = false;
48         for(i = 1; i <= n; i++){
49           if(g[i][i] > 1){
50             flag = true;
51             break;
52           }
53         }
54         if(flag)  printf("Case %d: Yes\n",iCase);
55         else printf("Case %d: No\n",iCase);
56     }
57     return 0;
58 }