999999*222222+333333*333334.
999999*222222+333333*333334．
<gadget id="calculator">999_999 * 222_222</gadget>
<output>222_221_777_778</output>

<gadget id="calculator">333_333 * 333_334</gadget>
<output>111_111_222_222</output>

<gadget id="calculator">222_221_777_778 + 111_111_222_222</gadget>
<output>333_333_000_000</output>

<result>333_333_000_000</result>