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#include <bits/stdc++.h>
using namespace std;
main()
{
    int test;
    int n, k;
    int arr[100000];
    cin >> test;
    for (int i = 1; i <= test; i++)
    {
        int cnt = 0;
        cin >> n >> k;
        for (int j = 0; j < n; j++)
        {
            cin >> arr[j];
        }

        for (int j = 0; j < n; j++)
        {
            if (arr[j]%3 == 0)
            {
                cnt++;
            }
        }
        if(cnt>1 && cnt<n)
        {
            cout<<"Case "<<test<<": "<<cnt<<endl;
        }
        else
        {
            cout<<"Case "<<test<<": "<<"0"<<endl;
        }
    }
}