while 1:
	try:
		stack = []
		st = raw_input().split()
		for s in st:
			if s == "-":
				stack.append(stack.pop(-2) - stack.pop())
			elif s == "+":
				stack.append(stack.pop(-2) + stack.pop())
			elif s == "/":
				stack.append(stack.pop(-2) / stack.pop())
			elif s == "*":
				stack.append(stack.pop(-2) * stack.pop())
			elif s == "%":
				stack.append(stack.pop(-2) % stack.pop())
			else:
				stack.append(float(s))
	
		print stack[0]
	except:
		pass