#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <cmath>
using namespace std;

int main()
{
    int t;
    cin>>t;
    while(t--){
        int n,i,a[50];
        scanf("%d",&n);
        for(i=0;i<n;i++)
            scanf("%d",a+i);
        sort(a,a+n);
        printf("%d\n",a[n-1]);
    }
    return 0;
}