Line up eight numbers from left to right, starting from the third number, each number is exactly equal to the sum of the two numbers before it, if the fifth number and the eighth number are 18 and 76 respectively, then the number How much is a number.
将八个数从左到右排成一行，从第3个数开始，每个数恰好等于它前面两个数之和，如果第5个数和第8个数分别是18和76，那么第一个数是多少．
<gadget id="calculator">76 + 18</gadget>
<output>94</output>

<gadget id="calculator">94 / 2</gadget>
<output>47</output>

<gadget id="calculator">76 - 47</gadget>
<output>29</output>

<gadget id="calculator">29 - 18</gadget>
<output>11</output>

<gadget id="calculator">18 - 11</gadget>
<output>7</output>

<result>7</result>