//40分解 给新手看的 STL之威

//C++ STL的威力
//短短几行，考场手速快的话5,6分钟就可以拿到40分
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <cstdlib>
using namespace std;
int main(){
    int n , ti , ki , x , m;
    vector<int> ship;
    cin >> n;
    for (int i=1;i<=n;++i){
        cin >> ti >> ki;
        for (int i=1;i<=ki;++i){
            cin >> x;
            ship.push_back(x);
        }
        sort(ship.begin(),ship.end());
        m=unique(ship.begin(),ship.end())-ship.begin();
        cout << m << endl;
    }
    return 0;
}