Tamtam collected 65 shells in total. She got 13 purple shells, 8 pink shells, 18 yellow shells, and 12 blue shells. The remaining shells are color orange. How many orange shells are there?
Tamtam has a total of 13 + 8 + 18 + 12 = 
<gadget id="calculator">13+8+18+12</gadget>
<output>51</output>
51 shells that are not orange.
Therefore, Tamtam has a total of 65 - 51 = 
<gadget id="calculator">65-51</gadget>
<output>14</output>
14 orange shells.

<result>14</result>