To cut a rectangle whose length and width are 170.3 cm and 65.5 cm respectively into some squares, how many knives should be cut at least.
将一个长和宽分别是170.3厘米和65.5厘米的长方形切割为一些正方形，最少需要切割多少刀．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<result>4</result>