<span style="font-size:12px;">#include<cstdio>
#include<cstring>
#define maxn 32
double map[maxn][maxn];
int n,t;

void floyd()
{
	int i,j,k;
	for(k=0;k<n;++k)
	{
		for(i=0;i<n;++i)
		{
			for(j=0;j<n;++j)
			{
				if(map[i][j]<map[i][k]*map[k][j])
				   map[i][j]=map[i][k]*map[k][j];
			}
		}
	}
	int sign=0;
	for(i=0;i<n;++i)
	{
		if(map[i][i]>1)//自身的汇率为1。若汇率大于1则说明能套汇 
		{
			sign=1;
			break;
		}  
	}
	if(sign)
	   printf("Yes\n");
	else 
	   printf("No\n");
}

int main()
{
	int m,i,j,a,b,t=1;;
	double c;
	char str[32][32],s1[32],s2[32];
	while(scanf("%d",&n)&&n)
	{
		for(i=0;i<n;++i)
		{
			for(j=0;j<n;++j)
				map[i][j]=0;
		}
		for(i=0;i<n;++i)
			scanf("%s",str[i]);
		scanf("%d",&m);
		while(m--)
		{
			scanf("%s%lf%s",s1,&c,s2);
			for(i=0;i<n;++i)
			{
				if(strcmp(s1,str[i])==0)
					a=i;
				if(strcmp(s2,str[i])==0)
					b=i;
			}
			map[a][b]=c;
		}
		printf("Case %d: ",t++);
		floyd();
	}
	return 0;
}</span>