include
int gcd(int a,int b);
int main()
{
int t,counter=0,arr[10005],n,m,i,j,max,u,g;
scanf("%d",&t);
while(t--)
{
max=0;
counter++;
scanf("%d %d",&n,&m);
for(i=0;i {
scanf("%d",&arr[i]);
if((max max=arr[i];
}
u=n-max;
g=gcd(u,n);
printf("Case #%d: %d/%d\n",counter,(u/g),(n/g));
}
return 0;
}
int gcd(int a, int b)
{
if(b==0)
return a;
return gcd(b,a%b);
}
