#include<cstdio>
#include<cmath>
#include<iostream>
#include<cstring>
#include<algorithm>
#include<string>
#include<stack>
#include<queue>
#include<set>
#include<map>
#include<utility>
#pragma comment(linker, "/STACK:102400000,102400000")
using namespace std;
const int MN=35+10;
const int ME=100000+10;
const double mod=1000000007;
typedef long long LL;
typedef unsigned long long ULL;
const double pi=acos(-1.0);
const int Intmax=(~(1<<31));
const int Intmin=(1<<31);
const LL LLmax=(~(1LL<<63));
const LL LLmin=(1LL<<63);
const ULL ULLmax=(~(0ULL));
int a[MN];
int main(){
#ifndef ONLINE_JUDGE
    freopen("1.cpp","r",stdin);
#endif // ONLINE_JUDGE
        int t;
        scanf("%d",&t);
        while(t--){
                int n;
                scanf("%d",&n);
                int i;
                for(i=0;i<n;i++){
                        scanf("%d",&a[i]);
                }
                sort(a,a+n);
                printf("%d\n",a[n-1]);
        }
        return 0;
}