p, c = map(int, input().split())

sum_prime = 41  # Sum of prime dice faces: 2+3+5+7+11+13 = 41
sum_composite = 49  # Sum of composite dice faces: 4+6+8+9+10+12 = 49

numerator = (sum_prime ** p) * (sum_composite ** c)
denominator = (6 ** (p + c))

expected_value = numerator / denominator

# Print with enough decimal places to ensure precision up to 1e-15
print("{0:.15f}".format(expected_value))