给出一个百分制成绩，要求输出其对应的成绩等级以及编程实现1!+2!+3!+4!+5!

C:\Documents and Settings\Administrator\桌面\myWebApplication\myWebApplication\bin\myWebApplication.dll C:\Documents and Settings\Administrator\桌面\myWebApplication\myWebApplication\bin\myWebApplication.pdb C:\Documents and Settings\Administrator\桌面\myWebApplication\myWebApplication\obj\Debug\ResolveAssemblyReference.cache C:\Documents and Settings\Administrator\桌面\myWebApplication\myWebApplication\obj\Debug\myWebApplication.dll C:\Documents and Settings\Administrator\桌面\myWebApplication\myWebApplication\obj\Debug\myWebApplication.pdb