a

#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/(x+1); else return x/(n+f(x,n-1)); } int main(){ int n,x; cin>>x>>n; printf("%.2lf",f(x,n)); return 0; }