#include<iostream> #include<cstdio> #include<string> #include<iomanip> #include<cmath> using namespace std; double f(int x,int n) { if(n==1) return (double)x/(x+1); else return (double)x/(n+f(x,n-1)); } int main(){ int x,y; cin>>x>>y; cout<<fixed<<setprecision(2)<<f(x,y); return 0; }