In PDF form I want to write script to count fileds with entry

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Java

PDF

forms

I'm creating a form and almost done. I need to have a totals items entered field at the bottom of a column and can't figure out how to write the Java script for this.
Help please?

If the field is blank, it should be 0 if any one of the other 4 drop down items are selected, it's value should be one with a total possible of 20.

What I have tried:

Found this and tried it but I'm getting a syntax error at Line 3

var total = 0;  
for (var i=1; i<=20; i++) 
{  for var f = this.getField "Type 1", "Type 2", "Type 3", "Type 4", Type 5", "Type 6", "Type 7", "Type 8" "Type 9", "Type 10", "Type 11", "Type 12", "Type 13", "Type 14", "Type 15", "Type 16", "Type 17", Type 18", "Type 19", "Type 20."+i);  
    if (f.valueAsString!="  ". && f.valueAsString!="Met", "FSBO","Exp."+i) total++;  }  
event.value = total;