Use rectangular tiles whose length and width are 17 cm and 13 cm to lay a square, and the interval between the tiles is 1 cm. How many such tiles are needed at least?
用长和宽分别为17厘米，13厘米的长方形瓷砖铺一个正方形，瓷砖之间间隔1厘米，至少需要多少块这样的瓷砖．
<gadget id="calculator">17 + 1</gadget>
<output>18</output>

<gadget id="calculator">126 / 18</gadget>
<output>7</output>

<gadget id="calculator">13 + 1</gadget>
<output>14</output>

<gadget id="calculator">126 / 14</gadget>
<output>9</output>

<gadget id="calculator">7 * 9</gadget>
<output>63</output>

<result>63</result>