What is the perimeter of a rectangle formed by 4 squares of 1 square decimeter?
用4个1平方分米的正方形拼成一个长方形，这个长方形的周长是多少
<gadget id="calculator">1 * 1 * 4</gadget>
<output>4</output>

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

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>