A student mistakenly regards "+" as "-" when calculating 41+N due to carelessness, and the result is 12. What should be the value of 41+N?
一个学生由于粗心，在计算41+N时，误将"+"看成"-"，结果得12，则41+N的值应为多少．
<gadget id="calculator">41 - 12</gadget>
<output>29</output>

<gadget id="calculator">41 + 29</gadget>
<output>70</output>

<result>70</result>