
import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int k=sc.nextInt();

        double ans=0;

        for(int i=1;i<=n;i++){
            int kakuritu=n;
            int score=i;
            while(score<k){
                score*=2;
                kakuritu*=2;
            }
            ans+=1/(double)kakuritu;
        }

        System.out.println(ans);

    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int k=sc.nextInt();

        double ans=0;

        for(int i=1;i<=n;i++){
            int kakuritu=n;
            int score=i;
            while(score<k){
                score*=2;
                kakuritu*=2;
            }
            ans+=1/(double)kakuritu;
        }

        System.out.println(ans);

    }
} Main public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int k=sc.nextInt();

        double ans=0;

        for(int i=1;i<=n;i++){
            int kakuritu=n;
            int score=i;
            while(score<k){
                score*=2;
                kakuritu*=2;
            }
            ans+=1/(double)kakuritu;
        }

        System.out.println(ans);

    } main {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int k=sc.nextInt();

        double ans=0;

        for(int i=1;i<=n;i++){
            int kakuritu=n;
            int score=i;
            while(score<k){
                score*=2;
                kakuritu*=2;
            }
            ans+=1/(double)kakuritu;
        }

        System.out.println(ans);

    } Scanner sc=new Scanner(System.in); sc new Scanner(System.in) int n=sc.nextInt(); n sc.nextInt() sc.nextInt sc int k=sc.nextInt(); k sc.nextInt() sc.nextInt sc double ans=0; ans 0 for(int i=1;i<=n;i++){
            int kakuritu=n;
            int score=i;
            while(score<k){
                score*=2;
                kakuritu*=2;
            }
            ans+=1/(double)kakuritu;
        } int i=1; int i=1; i 1 i<=n i n i++ i++ i {
            int kakuritu=n;
            int score=i;
            while(score<k){
                score*=2;
                kakuritu*=2;
            }
            ans+=1/(double)kakuritu;
        } {
            int kakuritu=n;
            int score=i;
            while(score<k){
                score*=2;
                kakuritu*=2;
            }
            ans+=1/(double)kakuritu;
        } int kakuritu=n; kakuritu n int score=i; score i while(score<k){
                score*=2;
                kakuritu*=2;
            } score<k score k {
                score*=2;
                kakuritu*=2;
            } score*=2 score 2 kakuritu*=2 kakuritu 2 ans+=1/(double)kakuritu ans 1/(double)kakuritu 1 (double)kakuritu System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int k=sc.nextInt();

        double ans=0;

        for(int i=1;i<=n;i++){
            int kakuritu=n;
            int score=i;
            while(score<k){
                score*=2;
                kakuritu*=2;
            }
            ans+=1/(double)kakuritu;
        }

        System.out.println(ans);

    }
} public class Main {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int k=sc.nextInt();

        double ans=0;

        for(int i=1;i<=n;i++){
            int kakuritu=n;
            int score=i;
            while(score<k){
                score*=2;
                kakuritu*=2;
            }
            ans+=1/(double)kakuritu;
        }

        System.out.println(ans);

    }
} Main

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int k=sc.nextInt();

        double ans=0;

        for(int i=1;i<=n;i++){
            int kakuritu=n;
            int score=i;
            while(score<k){
                score*=2;
                kakuritu*=2;
            }
            ans+=1/(double)kakuritu;
        }

        System.out.println(ans);

    }
}