P,C = map(int,input().split())
pl = [2,3,5,7,11,13]
cl = [4,6,8,9,10,12]
def dfsP(p):
	if p == 0:
		return 1.0
	ret = 0
	if p > 0:
		for i in pl:
			ret += dfsP(p - 1) * 1.0 / 6 * i
	return ret
def dfsC(c):
	if c == 0:
		return 1.0
	ret = 0
	if c > 0:
		for i in cl:
			ret += dfsC(c - 1) * 1.0 / 6 * i
	return ret
print(dfsP(P) * dfsC(C))