#include <bits/stdc++.h>
using namespace std;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int T;
    cin >> T;
    while(T--){
        int n, x;
        cin >> n >> x;
        vector<long long> a(n);
        for(auto &num: a) cin >> num;
        // The BOT can always eventually reach the cell with the maximum a_i
        // Thus, the answer is the maximum a_i
        long long max_a = *max_element(a.begin(), a.end());
        cout << max_a << "\n";
    }
}