#include <iostream>
using namespace std;

int main(){
    int n;
    cin >> n;
    
    if(n < 1){
        cout << "Invalid input";
        return 0;
    }
    
    int a[n];
    for(int i=0;i<n;i++) cin >> a [i];
    
    int min=a[0], max=a[i];
    
    for(int i=1;i<n;i++){
        if(a[i]<min) min=a[i];
        if(a[i]>max) max=a[i];
    }
    
    if(min==max)
       cout << "Invalid input";
    else
       cout << min+max;
}