#include<iostream> #include<cstdio> #include<cstring> #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 a,b; cin>>a>>b; printf("%.2lf\n",f(a,b)); return 0; }