#include<iostream>
#include<cstdio>
#include<fstream>
#include<cstring>
#include<algorithm>
#include<cstdlib>
#define MAXN 100006

int T,N;
int b[32];

int main()
{
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&N);
        for(int i=1;i<=N;i++)
           scanf("%d",&b[i]);
        
        int maxv=b[1];
        
        for(int i=2;i<=N;i++)
           if(b[i]>maxv)maxv=b[i];
        
        printf("%d\n",maxv);
        
    }
    
    return 0;
}