#include<bits/stdc++.h>

#define ll  long long
#define ull unsigned long long
#define ld long double
#define pii pair<ll,ll>
using namespace std;
#pragma GCC optimize(3)
#define N 600005
ll f[N];
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    ll T,Q;
    cin>>T;
    Q=T;
    while(T--)
    {
        ll n,a,sum=0;
        cin>>n;
        for(int i=0;i<n;i++)
        {
            cin>>a;
            sum+=a;
        }
        cout<<"Case #"<<Q-T<<": "<<sum/(n-1)+1<<endl;
    }
    return 0;
}