#include <iostream>

double fan(int n);

using namespace std;
double sum=1;
int a;
int main()
{
    int n=3;
    a=n;

    cout << sum/fan(n);;

}

double fan(int n) {
    cout << n << endl;
    if(a!=1){
        a-=2;
        sum/=fan(n-2);
    }
    return   abs((n-2) + n^(-1));
}