#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() 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 x, n; cin>>x>>n; double r=f(x, n); printf("%.2lf",r); return 0; }