Li Hong has 2 stamps of 1.20 yuan and 1.50 yuan each. How much postage can he pay with these stamps?
李红有1.20元和1.50元的邮票各2枚，他能用这些邮票付多少种邮资．
<gadget id="calculator">1.5 + 1.5</gadget>
<output>3</output>

<gadget id="calculator">2 + 3 + 2 + 1</gadget>
<output>8</output>

<result>8</result>