#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
    int n;cin>>n;
    vector<int> A(n);
    for(int i = 0; n > i; i++){
        cin>>A[i];
    }
    sort(A.begin(),A.end());
    if(n%2){
        cout << A[0] << endl;;
    }else{
        cout << A[0]*A[1] << endl;
    }
}