import string

def posbincon(userInput):
	if userInput == 0: return 0
	binaryString = ''
	while userInput > 0:
		j = userInput & 1
		binaryString = str(j) + binaryString
		userInput >>= 1
	return binaryString
def negbincon(userInput):
	result = list(posbincon(0-userInput))
	con = False
	bit = len(result)
	while bit > 0:
		if con is False and result[bit-1] is '1': con = True
		elif con is True:
			if result[bit-1] is '0': result[bit-1] = '1'
			elif result[bit-1] is '1': result[bit-1] = '0'
		bit -= 1
	result = '1'+string.join(result, '')
	return result

print "Welcome to the Ultimate, low budget binary to decimal converter"
print "Now including Two's Complement"

userInput = str
while type(userInput) is not int:
	userInput = raw_input("Enter the number here:> ")
	try:
		userInput = int(userInput)
	except:
		print "Input must be an integer."

if userInput >= 0:
	print "The binary value of %s is %s" %(userInput, posbincon(userInput))
else:
	print "The binary value of %s is %s" %(userInput, negbincon(userInput))