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