#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
using namespace std;
#define ll long long
int t,n,i,j,a[100];
int main()
{
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d",&n);
        for(i=j=0;i<n;j=max(j,a[i++]))scanf("%d",a+i);
        printf("%d\n",j);
    }
    return 0;
}