When two natural numbers are divided, the quotient is 19 and the remainder is 12. It is known that the sum of the dividend, divisor, quotient and remainder is 343, what is the dividend?
有两个自然数相除，商是19，余数是12，已知被除数、除数、商与余数之和等于343，则被除数是多少？
<gadget id="calculator">19 * 20</gadget>
<output>380</output>

<gadget id="calculator">380 + 12</gadget>
<output>392</output>

<result>392</result>