Reclassifying a polygon using field calculator

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I am trying to reclassify a polygon into three classes:

1 and 2 =5 , 3 and 4 = 3 and 5 = 1

I have been trying to do this by calculating a new field in the attribute table but I am very inexperienced with Python so have tried it VB script. Is there anyone out there that could help me with a basic IF function.

I have tried this:

if [Sal_AlkCL]=1,2 Then [Salscore] = "5"if [Sal_AlkCL]=3,4 Then [Salscore] = "3"if [Sal_AlkCL]=1 Then [Salscore] = "1"end if

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