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