#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
unsigned long long a[6666];
unsigned long long b[] = {1ull, 10ull, 100ull, 1000ull, 10000ull, 100000ull, 1000000ull, 10000000ull, 100000000ull, 1000000000ull, 10000000000ull};
int main()
{
    //freopen(R"(C:\Users\Administrator\Desktop\coj8\p122.in)", "r", stdin);
    int T, n;
    scanf("%d", &T);
    for (int t = 1; t <= T; t++)
    {
        printf("Case #%d: ", t);
        scanf("%d", &n);
        for (int i = 0; i < n; i++)
            scanf("%llu", a + i);
		unsigned long long refans = numeric_limits<decltype(refans)>::max();
        for (int i = 0; i < n; i++)
            for (int j = 0; j < i; j++)
                refans = max(a[j] * *upper_bound(b, b + 11, a[i]) + a[i], refans);
        printf("Case #%d: %llu\n", t, refans);
    }
    return 0;
}