To make 1243 divisible by 3, what is the least amount that must be added to the divisor
要使1243能够被3整除，被除数最少要加上多少
<gadget id="calculator">1 + 2 + 4 + 3</gadget>
<output>10</output>

<gadget id="calculator">12 - 10</gadget>
<output>2</output>

<result>2</result>