 medium">【样例输入3】</span></div>
<div style="text-indent: 21pt" align="left"><span style="font-size: medium">2 0 1 2</span></div>
<div align="left"><span style="font-size: medium">【样例输出3】</span></div>
<div style="text-indent: 21pt" align="left"><span style="font-size: medium">INF</span></div>
<div align="left"><span style="font-size: medium">【数据范围】</span></div>
<p>
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