A picture is 40 centimeters long and 32 centimeters wide. To make it into a jigsaw puzzle, each piece of the jigsaw puzzle is a square. Can you use a square with an integer side length of at least how many centimeters?
一幅图长40厘米，宽32厘米，要把它做成拼图，每块拼图都是正方形，都可以用整数边长至少是多少厘米的正方形？
<gadget id="calculator">2 * 2 * 2 * 2 * 2 * 5</gadget>
<output>160</output>

<result>160</result>