#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 m,double n){ if (n==1) return m/(1+m) else return m/(n+f(m,n-1)) } int main(){ duoble a,b; cin>>a>>b; printf("%.2lf",f(a,b)); return 0; }