Put a gold border on the edge of a round dart board with a diameter of 50 centimeters. The joint of the gold border is 3 centimeters. How many centimeters should the gold border be at least?
给一个直径是50厘米的圆形飞镖盘的边上镶上一条金边，金边的接口处是3厘米，这条金边至少要有多少厘米？
<gadget id="calculator">3.14 * 50</gadget>
<output>157</output>

<gadget id="calculator">157 + 3</gadget>
<output>160</output>

<result>160</result>