How many kinds of different postages can be formed by randomly selecting one or several stamps from five stamps with a face value of 1 yuan and four stamps with a face value of 1.60 yuan.
从五枚面值为1元的邮票和四枚面值为1.60元的邮票中任取一枚或若干枚，可组成不同的邮资多少种．
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<result>29</result>