There are four kinds of magazines A, B, C, and D. You can subscribe to at least 2 magazines and subscribe to a maximum of 4 magazines. How many different subscription methods are there?
有甲、乙、丙、丁四种杂志，最少订阅2种，最多订阅4种，有多少种不同的订阅方法？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<gadget id="calculator">3 / 3</gadget>
<output>1</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<gadget id="calculator">6 + 4 + 1</gadget>
<output>11</output>

<result>11</result>