#include <bits/stdc++.h>
#define int long long
using namespace std;
bool cmp(int q, int h) {
	return q > h;
}
int n, a[99999];
signed main() {
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	sort(a + 1, a + 1 + n, cmp);
	for (int i = 2; i <= n; i++) {
		if (a[i] != a[i - 1]) {
			cout << a[i];
			return 0;
		}
	}
	return 0;
}