阶乘的准确值

<span style="font-size:11.0pt;font-family:宋体;">计算</span><i><span style="font-size:11.0pt;font-family:Consolas;">n</span></i><span style="font-size:11.0pt;font-family:Consolas;">!=1×2×3×</span><span style="font-size:11.0pt;font-family:宋体;">．．．</span><span style="font-size:11.0pt;font-family:Consolas;">×<i>n</i></span><span style="font-size:11.0pt;font-family:宋体;">的精确结果</span><span id="__kindeditor_bookmark_start_0__"></span>。

有多行数据，每行只有一items正整数N，不超过1000.

每行输出N！。