#include <stdio.h>

int dices[12];
long long int sum = 0;

void saiki(long long int mul, int diceNum, int diceMax){
	int i;
	int dice[2][6] = {
		{2,3,5,7,11,13},
		{4,6,8,9,10,12}
	};
	
	if( diceMax == diceNum ){
		sum += mul;
		return;
	}
	
	for(i=0;i<6;i++){
		saiki( mul * dice[dices[diceNum]][i], diceNum+1, diceMax);
	}
	return;
}

int main(void){
	long long int mul = 1;
	int a;
	double b,c;
	int i,p,q;
	
	scanf("%d %d", &p, &q);
	for(i=0;i<q;i++){
		dices[i] = 1;
	}
	for(i=0;i<(p+q);i++){
		mul *= 6;
	}
	
	saiki(1, 0, p+q);
	
	c = (double)mul;
	
	a = (int)(sum / mul);	//　整数部
	b = (int)(sum % mul);	// 小数部
	b = b / c;
	b = b + (double)a;
	
	printf("%.10f\n", b);
	return 0;
}