#include<iostream> #include<cstdio> #include<iomanip> using namespace std; double f(int x,double n){ if(n==1) return x*1.0/(n+x); return x*1.0/(n+f(x,n-1)); } int main(){ double x,n; cin>>x>>n; printf("%.2lf",f(x,n)); return 0; }