import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		int[] prime_dice = {2,3,5,7,11,13};
		int[] not_prime_dice = {4,6,8,9,10,12};
		
		final double prime_E = Arrays.stream(prime_dice).average().getAsDouble();
		final double not_prime_E = Arrays.stream(not_prime_dice).average().getAsDouble();
		
		final int P = sc.nextInt();
		final int C = sc.nextInt();
		
		double answer = 1;
		for(int i = 0; i < P; i++){
			answer *= prime_E;
		}
		for(int i = 0; i < C; i++){
			answer *= not_prime_E;
		}
		System.out.printf("%.14f\n", answer);
	}
	
}