zad9

#include <iostream>
#include <cctype>
#include <cstring>
#include <iomanip>
using namespace std;

float funkcija(int* arr, int n, int i) {
    if (i == n - 1) {
        return arr[i];
    }
    return arr[i] + 1.0/funkcija(arr, n, i+1);
}

int main() {
    int n;
    cin >> n;
    int array[n];
    for (int i = 0; i < n; i++) {
        cin >> array[i];
    }
    cout<<funkcija(array, n, 0)<<endl;

}