#include <iostream>
#include <cmath>
using namespace std;
int main(){
int i,n,v[20];
//Citire vector
cin >> n;
for(i=0;i<n;i++) cin >> v[i];
float produs=1, c=0;
for(i=0;i<n;i++){
if(v[i]%2==1){
produs = produs*v[i];
c++;
}
}
cout << "Media geometica : " << pow(produs, 1/c);
}