#include "iostream"
#include "set"
using namespace std;
struct comp
{
bool operator() (const int &a, const int &b)
{
if (a != b)
return a > b;
else
return a > b;
}
};
int main()
{
int num;
while (cin >> num && num != 0)
{
set<int, comp> s;
set<int, comp>::iterator it;
for (int i = 0; i < num; i++)
{
int temp;
cin >> temp;
s.insert(temp);
}
it = s.begin();
cout << (*it) << endl;
}
}