#include <cstdio>
using namespace std;
int main()
{
int t;
scanf("%d",&t);
for(int test=1;test<=t;test++)
int n;
scanf("%d",&n);
long long ans=0;
for(int i=0;i<n;i++)
int tmp;
scanf("%d",&tmp);
ans+=tmp;
}
ans/=2;
printf("Case #%d: %lld\n",test,ans);
return 0;