If four 15cm-long color strips are pasted together, and the pasted parts are all 1 cm, how many meters is the total length of the pasted color strips?
如果将4张15厘米长的彩条粘贴起来，粘贴的部分都是1厘米，粘好的彩条全长多少米？
<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<gadget id="calculator">60 - 3</gadget>
<output>57</output>

<result>57</result>