再求fx

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