#include <iostream>
#include<algorithm>
using namespace std;
#include<string.h>
#include<map>
int main()
{
     long long t,n,a[50],i,maxn;
     cin>>t;
     while(t--)
     {  maxn=-1;
         cin>>n;
         for(i=0;i<n;i++)
         {
            cin>>a[i];
            if(maxn<a[i])
                maxn=a[i];
         }

         cout<<maxn<<endl;
     }
    return 0;
}