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