#include<cstdio>
#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
int a[40];
int main(){
    int t,n,i,j,max=-1;
    cin>>t;
    while(t--){
        max=-1;
        cin>>n;
        for(i=0;i<n;i++){
            scanf("%d",&a[i]);
            if(max<a[i])max=a[i];
        }
        cout<<max<<endl;
    }
    return 0;
}