#include<iostream>
#include<cstdio>
using namespace std;
double f(int x,int n)
{
	if(n==1)
	{
		return x+1;
	}
	return x*1.0/(n+f(x,n-1));
}
int main()
{
    int x,n;
    cin>>x>>n;
    printf("%.2f",f(x,n));
    return 0;
}