Selenium IDE decrement value of var -

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Hello I'm trying to bring a simple reduction in selenium but it is decreasing, returning it in return . Follow my code: 

  & lt; Tr & gt; & Lt; TD & gt; Shop & lt; / TD & gt; & Lt; TD & gt; 2 & lt; / TD & gt; & Lt; TD & gt; Contador & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; TD & gt; Shop & lt; / TD & gt; & Lt; TD & gt; $ {Contador} - & lt; / TD & gt; & Lt; TD & gt; Contador & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; TD & gt; Echo & lt; / TD & gt; & Lt; TD & gt; $ {Contador} & lt; / TD & gt; & Lt; TD & gt; & Lt; / TD & gt; & Lt; / TR & gt; Expected: 1  
 but get: 2 -   
 
 
 I've found it! Any example ""  
  & lt; Tr & gt; & Lt; TD & gt; Shop & lt; / TD & gt; & Lt; TD & gt; 2 & lt; / TD & gt; & Lt; TD & gt; Contador & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; TD & gt; StoreEval & lt; / TD & gt; & Lt; Td> Archived ['contador'] = $ {contador} -1 & lt; / Td> & Lt; TD & gt; Contador & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; TD & gt; Echo & lt; / TD & gt; & Lt; TD & gt; $ {Contador} & lt; / TD & gt; & Lt; TD & gt; & Lt; / TD & gt; & Lt; / TR & gt;  
 
 Now the result is 1!

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