#include 
     
       #include 
      
        using namespace std;   int find_second_max(const int* data,const int count)  {  	if (!count || count == 1)  		return -1;  	  	int maxVal = data[0] > data[1] ? data[0] : data[1];  	int smaxVal = data[0] + data[1] - maxVal;  	  	for (int i = 0;i < count;i++)  	{  		if (data[i] > maxVal)  		{  			smaxVal = maxVal;  			maxVal = data[i];  		}  		else if (data[i] < maxVal && data[i] > smaxVal)  			smaxVal = data[i];  	}  	  	return smaxVal;  }  int main() { 	freopen("input.txt","r",stdin); 	int n; 	while (cin >> n) 	{ 		int num[n]; 		for (int i = 0;i < n;i++) 			cin >> num[i]; 		int smax = find_second_max(num,n); 		cout << smax << endl; 	} }