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import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n,m;
        float[] nums;
        int start,end;
        while(sc.hasNext()){
            n = sc.nextInt();
            m = sc.nextInt();
            nums = new float[n*6+1];
            if(m < n || m > 6*n){
                System.out.println("0.00");
            }
            else{
                for(int i = 0; i < (n*6+1); i++){
                    nums[i] = 0;
                }
                for(int i = 1; i < 7; i++){
                    nums[i] = ((float)1)/6;
                }
                for(int i = 1; i < n; i++){
                    start = i+1;
                    end = 6 * start;
                    for(int j = end; j >= start; j--){
                        nums[j] = 0;
                        for(int k = 1; k <= 6; k++){
                            if(j - k > 0 && j-k >= start-1){
                                nums[j] += nums[j-k] / 6;
                            }
                        }
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