#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
const int N=50;
int a[N];
int main()
{
    int t,n,i,j,maxn;
    scanf("%d",&t);
    while(t--)
    {
        maxn=0;
        scanf("%d",&n);
        for(i=0;i<n;i++)
        {
            scanf("%d",&a[i]);
            if(maxn<a[i])maxn=a[i];
        }
        printf("%d\n",maxn);
    }
    return 0;
}