aoj0087.py

#! -*- coding: utf-8-unix -*-
import sys

if __name__=='__main__':
  lines = [x.strip() for x in sys.stdin.readlines() if x != '' and x != '\n']
  for line in lines:
    cs = line.split()
    stack = []
    res = 0.0
    for c in cs:
      res = ''
      if not(c == '-' or c == '+' or c == '*' or c == '/'):
        res = float(c)
      else:
        s1, s2 = stack.pop(), stack.pop()
        if c == '-':
          res = s2 - s1
        elif c == '+':
          res = s2 + s1
        elif c == '*':
          res = s2 * s1
        elif c == '/':
          res = s2 / s1
      stack.append(res)
    assert(len(stack) == 1)
    print stack[0]