257-101-102．
257-101-102．
<gadget id="calculator">100 + 1</gadget>
<output>101</output>

<gadget id="calculator">100 + 2</gadget>
<output>102</output>

<gadget id="calculator">257 - 101 - 102</gadget>
<output>54</output>

<result>54</result>