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