a, b, and c are all prime numbers, c is a single digit, and a•b+c=1993, then a+b+c=how much.
a、b、c都是质数，c是一位数，且a•b+c=1993，那么a+b+c=多少．
<gadget id="calculator">11 + 181 + 2</gadget>
<output>194</output>

<result>194</result>