S_N = R_1 R_2 \cdots R_N S_0
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Recent Referers:
  1. http://formula.s21g.com/?S_N%20%3D%20R_1%20R_2%20%5Ccdots...
  2. https://www.google.com/
  3. http://mglab.blogspot.com/2010_07_01_archive.html?m=1
  4. http://mglab.blogspot.com/2010/
  5. http://mglab.blogspot.com/search/label/%E9%87%91%E8%9E%8D...