Have you ever heard of the unit "○○ tsubo" that expresses the area of ​​land? Since ancient times, one samurai has said the area for making rice to eat in a day.

There is a land of a [m] x b [m]. Enter a and b and create a program that outputs the tsubo area S [tsubo] of the land. 1 tsubo = 3.305785 [m2], and a and b are integers less than or equal to 100.



input


a b


A and b separated by one space are given on one line.

output

Output the tsubo area S in one line. An error of 0.0001 or less is allowed.

Example

Input

15 25


Output

113.437508

Source: aizu | Difficulty: UNKNOWN_DIFFICULTY


Solutions:
(a, b) = (int(x) for x in input().split())
s = a * b
S = s / 3.305785
print('{0:.6f}'.format(S))


(a, b) = map(int, input().split())
S = float(a * b / 3.305785)
print(S)


(a, b) = map(int, input().split())
print('{:6f}'.format(a * b / 3.305785))


(a, b) = map(int, input().split())
print(a * b / 3.305785)


(a, b) = map(float, input().split())
print(format(a * b / 3.305785, '.6f'))


import math
(a, b) = map(int, input().split())
c = float(3.305785)
S = a * b / c
print('{:.6f}'.format(S))


(a, b) = map(int, input().split())
print(f'{a * b / 3.305785:.6f}')


(a, b) = map(int, input().split())
s = a * b / 3.305785
print(f'{s:.4f}')


(a, b) = list(map(float, input().split()))
print(a * b / 3.305785)


import math
(a, b) = map(int, input().split())
s = a * b
t = 3.305785
print(f'{s / t:.4f}')


(a, b) = map(int, input().split())
print(f'{a * b / 3.305785:.6f}')


(a, b) = map(int, input().split())
s = a * b
t = s / 3.305785
print(f'{t:.6f}')


(a, b) = input().split()
a = float(a)
b = float(b)
s = a * b / 3.305785
print(f'{s:.6f}')


s = input().split()
a = int(s[0])
b = int(s[1])
print('{:.6f}'.format(a * b / 3.305785))


(a, b) = map(int, input().split())
s = a * b / 3.305785
print(f'{s:8.6f}')


(a, b) = input().split()
a = float(a)
b = float(b)
s = a * b / 3.305785
print(s)


(a, b) = map(int, input().split())
print('{0:.6f}'.format(a * b / 3.305785))


(a, b) = map(int, input().split())
x = 3.305785
s = a * b / x
print('{:.6f}'.format(s))


(a, b) = [float(i) for i in input().split()]
print(a * b / 3.305785)


(a, b) = map(int, input().split())
c = a * b
d = 3.305785
e = c / d
print(f'{e:.6f}')


while True:
	try:
		(a, b) = tuple(map(int, input().split()))
	except:
		break
	print(a * b / 3.305785)


(a, b) = input().split()
a = int(a)
b = int(b)
c = a * b / 3.305785
print(f'{c:.6f}')


t = 3.305785
(a, b) = map(int, input().split())
print('{0:.6f}'.format(a * b / t))


(a, b) = map(int, input().split())
print(round(a * b / 3.305785, 6))


(a, b) = map(int, input().split())
print(a * b / 3.305785)


(a, b) = map(int, input().split())
f = a * b
c = f / 3.305785
print(f'{c:4f}')


(a, b) = map(int, input().split())
x = a * b / 3.305785
print('{:.6f}'.format(x))


try:
	while True:
		(a, b) = map(float, input().split())
		S = a * b / 3.305785
		print(S)
except EOFError:
	pass


(a, b) = (int(x) for x in input().split())
S = a * b / 3.305785
print(S)


import sys

def sm_to_tsubo(a, b):
	return a * b / 3.305785

def main(args):
	for line in sys.stdin:
		(a, b) = [int(x) for x in line.strip().split(' ')]
		result = sm_to_tsubo(a, b)
		print('{:.6f}'.format(result))
main(sys.argv[1:])


(a, b) = map(int, input().split())
S = a * b / 3.305785
print(format(S))


import sys

class math:
	pi = 3.141592653589793

	def gcd(self, a, b):
		if b == 0:
			return a
		return self.gcd(b, a % b)

	def lcm(self, a, b):
		return a * b // self.gcd(a, b)

	def Pnum(self, a):
		if a == 1:
			return False
		for i in range(2, int(a ** 0.5) + 1):
			if a % i == 0:
				return False
		return True

	def caria(self, r):
		return r * r * self.pi
math = math()

class output:

	def list(self, l):
		l = list(l)
		print(' ', end='')
		for (i, num) in enumerate(l):
			print(num, end='')
			if i != len(l) - 1:
				print(' ', end='')
		print()
output = output()
(a, b) = [float(x) for x in input().split()]
print(a * b / 3.305785)


(a, b) = map(float, input().split())
S = a * b
print(S / 3.305785)


(a, b) = map(lambda x: int(x), input().split())
tubo = a * b / 3.305785
print(tubo)


(a, b) = map(float, input().split())
S = a * b / 3.305785
print(S)


(a, b) = (int(x) for x in input().split())
if a <= 100 and b <= 100:
	print(f'{a * b / 3.305785:.4f}')


(a, b) = map(int, input().split())
print('{:.6f}'.format(a * b / 3.305785))


(a, b) = map(float, input().split())
one_pod = 3.305785
pod = a * b / one_pod
print('%.6f' % pod)


(a, b) = map(int, input().split())
print(format(a * b / 3.305785))


(a, b) = map(int, input().split())
S = a * b / 3.305785
print('{:f}'.format(S))


(a, b) = map(float, input().split())
x = a * b / 3.305785
print(f'{x:.06f}')


(a, b) = map(float, input().split())
print(f'{a * b / 3.305785:.4f}')


(a, b) = map(float, input().split())
S = a * b / 3.305785
print(S)


(a, b) = map(int, input().split())
print('{:.6f}'.format(a * b / 3.305785))


N = input().split()
a = N[0]
b = N[-1]
a = int(a)
b = int(b)
c = a * b
c = float(c)
d = c / 3.305785
print(d)


(a, b) = map(int, input().split())
S = a * b / 3.305785
print('{0:6f}'.format(S))


(a, b) = map(float, input().split())
s = a * b
S = s / 3.305785
print(f'{S:0.06f}')


(a, b) = map(int, input().split())
S = 3.305785
print(format(a * b / S, '.6f'))


(a, b) = map(int, input().split())
S = a * b / 3.305785
print(S)


(a, b) = map(float, input().split())
print('{:.6f}'.format(a * b / 3.305785))


(a, b) = map(int, input().split())
s = a * b
t = s / 3.305785
print(f'{t:.5f}')


(a, b) = map(int, input().split())
S = a * b / 3.305785
print('{:.7f}'.format(S))


(a, b) = map(float, input().split())
print(a * b / 3.305785)


(a, b) = map(int, input().split())
print(a * b / 3.305785)


(a, b) = [float(x) for x in input().split()]
S = a * b / 3.305785
print(f'{S:.6f}')


import sys, math, os
PYDEV = os.environ.get('PYDEV')
if PYDEV == 'True':
	sys.stdin = open('sample-input.txt', 'rt')
(a, b) = [int(_) for _ in input().split()]
A = a * b / 3.305785
print('%.6f' % A)


(a, b) = map(int, input().split())
S = a * b / 3.305785
print('{0:.4f}'.format(S))


while True:
	try:
		(a, b) = map(int, input().split(' '))
	except:
		break
	print(a * b / 3.305785)


(a, b) = map(int, input().split())
print(f'{a * b / 3.305785:.07f}')


(a, b) = map(int, input().split())
S = float(a * b / 3.305785)
print('{:.6f}'.format(S))


(a, b) = map(float, input().split())
print(f'{a * b / 3.305785:.6f}')


(a, b) = (int(x) for x in input().split())
print('{:.6f}'.format(a * b / 3.305785))


(a, b) = map(int, input().split())
k = a * b
S = k / 3.305785
print(f'{S:.6f}')


(a, b) = map(float, input().split())
print(a * b / 3.305785)


(a, b) = map(int, input().split())
s = a * b / 3.305785
print(s)


(a, b) = map(int, input().split())
print('{0:.6f}'.format(a * b / 3.305785))


(a, b) = map(float, input().split(' '))
print(a * b / 3.305785)


(a, b) = map(float, input().split())
S = a * b / 3.305785
print('{:.6f}'.format(S))


(a, b) = map(int, input().split())
x = a * b / 3.305785
print('{0:8.6f}'.format(x))


(a, b) = map(int, input().split())
s = a * b / 3.305785
print(f'{s:.6f}')


(a, b) = [int(i) for i in input().split()]
print('{:.6f}'.format(float(a * b) / 3.305785))


(a, b) = map(float, input().split())
s = a * b / 3.305785
print(s)


(a, b) = map(float, input().split())
T = a * b / 3.305785
print(f'{T:.6f}')


(a, b) = map(int, input().split())
S = a * b / 3.305785
print(f'{S:.6f}')


def test():
	(a, b) = list(map(int, input().split()))
	c = 3.305785
	s = a * b / c
	return s
print(test())


(a, b) = map(int, input().split())
S = a * b
print('{0:.10}'.format(S / 3.305785))


(a, b) = map(int, input().split())
s = a * b / 3.305785
print(f'{s:.6f}')


(a, b) = map(int, input().split())
S = a * b / 3.305785
print(S)


from functools import reduce
print(reduce(lambda x, y: int(x) * int(y), input().split(' ')) / 3.305785)


import math
(a, b) = map(int, input().split())
S = a * b / 3.305785
print(f'{S:.6f}')


(a, b) = input().split()
c = int(a) * int(b) / 3.305785
print(f'{c:.6f}')


(a, b) = (int(x) for x in input().split())
print(f'{a * b / 3.305785:4f}')


(a, b) = map(int, input().split())
c = a * b / 3.305785
print(f'{c:.6f}')


S = 3.305785
(a, b) = map(int, input().split())
print('{:.6f}'.format(a * b / S))


(a, b) = map(int, input().split())
s = a * b / 3.305785
print(s)


(a, b) = map(int, input().split())
x = a * b / 3.305785
print(f'{x:0.6f}')


(a, b) = map(float, input().split())
print('{:.6f}'.format(a * b / 3.305785))


import sys
import os
import math
(a, b) = map(int, input().split())
print(a * b / 3.305785)


(a, b) = list(map(float, input().split()))
print('{0:.6f}'.format(a * b / 3.305785))


(a, b) = map(int, input().split())
s = a * b / 3.305785
print('{:.6f}'.format(s))


(a, b) = map(int, input().split())
print('{:06f}'.format(a * b / 3.305785))


import sys
for line in sys.stdin:
	l = line.split()
	a = float(l[0])
	b = float(l[1])
	print(a * b / 3.305785)


(a, b) = map(int, input().split())
S = a * b / 3.305785
print('{:.6f}'.format(S))


(a, b) = map(int, input().split())
print(round(a * b / 3.305785, 6))


(a, b) = map(float, input().split())
S = a * b / 3.305785
print('{:.06f}'.format(S))


(a, b) = map(int, input().split())
c = a * b / 3.305785
print(f'{c:4f}')


(a, b) = map(int, input().split())
S = a * b / 3.305785
print(format(S, '.10'))


(a, b) = map(int, input().split())
c = a * b / 3.305785
print(round(c, 6))


(a, b) = map(int, input().split())
s = 3.305785
print('{:.6f}'.format(a * b / s))


from decimal import Decimal as d
(a, b) = list(map(d, input().split()))
print('{:.6f}'.format(a * b / d('3.305785')))


(a, b) = map(int, input().split())
S = round(a * b / 3.305785, 6)
print(S)


(a, b) = map(int, input().split())
print('{:.6f}'.format(a * b / 3.305785))


(a, b) = map(int, input().split())
s = a * b
S = s / 3.305785
print('{:.5f}'.format(S))


(a, b) = map(int, input().split())
x = a * b / 3.305785
print(f'{x:.6f}')


(a, b) = map(int, input().split())
c = 3.305785
print('{:.6f}'.format(a * b / c))


(a, b) = (int(x) for x in input().split())
if a <= 100 and b <= 100:
	print('{:.4f}'.format(a * b / 3.305785))
else:
	pass


(a, b) = map(int, input().split())
print(format(a * b / 3.305785, '.6f'))


(a, b) = (int(x) for x in input().split(' '))
c = a * b / 3.305785
print(c)


(a, b) = map(int, input().split())
print(format(a * b / 3.305785, '.5f'))


(a, b) = map(int, input().split())
c = float(3.305785)
S = a * b / c
print('{:.6f}'.format(S))


(a, b) = map(int, input().split())
t = 3.305785
s = a * b / t
print(f'{s:.06f}')


(a, b) = map(int, input().split())
s = a * b
print(s / 3.305785)


(x, y) = map(int, input().split())
print('%f' % (x * y / 3.305785))


x = input().split()
y = list(map(int, x))
a = y[0]
b = y[1]
c = a * b / 3.305785
print('{0:.6f}'.format(c))


(a, b) = map(int, input().split())
h = a * b
print(f'{h / 3.305785:.6f}')


(a, b) = map(float, input().split())
print(a * b / 3.305785)


(a, b) = map(int, input().split())
c = a * b / 3.305785
print('{:.6f}'.format(c))


(a, b) = [int(x) for x in input().split()]
print('{:.6f}'.format(a * b / 3.305785))


(a, b) = map(int, input().split())
print(a * b / 3.305785)


(a, b) = (float(x) for x in input().split())
S = a * b / 3.305785
print(f'{S:.6f}')


(a, b) = map(int, input().split())
t = a * b / 3.305785
print(t)


(a, b) = map(int, input().split())
s = a * b
S = s / 3.305785
print(f'{S:.6f}')


(a, b) = map(float, input().split())
S = print('{:.6f}'.format(a * b / 3.305785))


(a, b) = map(int, input().split())
S = a * b / 3.305785
print('{0:6f}'.format(S))


(a, b) = map(int, input().split())
c = a * b
d = c / 3.305785
print(f'{d:2.06f}')


(a, b) = map(int, input().split())
print(f'{a * b / 3.305785:9.6f}')


(a, b) = map(int, input().split())
s = a * b / 3.305785
print(f'{s:6f}')


(a, b) = map(int, input().split())
print(a * 1.0 * b / 3.305785)


(a, b) = map(float, input().split())
print('{:.6f}'.format(a * b / 3.305785))


k = list(map(int, input().split()))
a = k[0]
b = k[1]
base = 3.305785
print(a * b / base)


(a, b) = map(int, input().split())
print(float(a * b / 3.305785))


(a, b) = map(int, input().split(' '))
print(a * b / 3.305785)


(a, b) = map(float, input().split())
print('%.6f' % (a * b / 3.305785))


(a, b) = map(int, input().split())
S = float(a * b / 3.305785)
print(f'{S:.6f}')


(a, b) = map(int, input().split())
print(f'{a * b / 3.305785:.06f}')


(a, b) = map(int, input().split())
S = a * b / 3.305785
print(format(S))


(a, b) = map(int, input().split())
s = 3.305785
print(f'{a * b / s:.06f}')


(a, b) = map(int, input().split())
S = a * b / 3.305785
print(f'{S:6.5f}')


(a, b) = [float(int(i)) for i in input().split()]
c = a * b / 3.305785
print('{:.6f}'.format(c))


(a, b) = map(int, input().split())
print(f'{a * b / 3.305785:.6f}')


(a, b) = map(int, input().split())
if a <= 100 and b <= 100:
	print(f'{a * b / 3.305785: .6f}')
else:
	pass


(a, b) = map(float, input().split())
print(f'{a * b / 3.305785:.5f}')


while True:
	try:
		(n, m) = map(int, input().split())
		if n == 0 and m == 0:
			break
		ans = n * m / 3.305785
		print('{:.5f}'.format(ans))
	except EOFError:
		break


import sys
f = sys.stdin
(a, b) = map(int, f.readline().split())
print('{:.6f}'.format(a * b / 3.305785))


(a, b) = list(map(float, input().split()))
print(a * b / 3.305785)


(a, b) = map(int, input().split())
t = 3.305785
S = a * b / t
print('{:.6f}'.format(S))


(a, b) = map(int, input().split())
x = a * b
print(format(x / 3.305785, '.6f'))


(a, b) = map(int, input().split())
x = 3.305785
print('{:.6f}'.format(a * b / x))


(a, b) = map(int, input().split())
S = a * b / 3.305785
print(f'{S:.06f}')


(a, b) = map(int, input().split())
print('{:.6f}'.format(a * b / 3.305785))


import math
(a, b) = map(int, input().split())
s = a * b
S = s / 3.305785
print('{:.6f}'.format(S))


(A, B) = map(float, input().split())
print(A * B / 3.305785)


(a, b) = map(int, input().split())
S = a * b / 3.305785
print(f'{S:.5f}')


(a, b) = map(int, input().split())
S = a * b / 3.305785
print(f'{S:.6f}')


(a, b) = map(int, input().split())
x = 3.305785
print(a * b / x)