文件目录

#include <iostream>
#include <cmath>
using namespace std;
// f(x,n)=x/(n+f(x,n-1))
double f(double x, int n)
{
    if (n == 1)
        return x / (1 + x);
    return x / (n + f(x, n - 1));
}
int main()
{
    int n;
    double x;
    cin >> x >> n;
    printf("%.2lf", f(x, n));
    return 0;
}