Custom Script - Values Divided by 4

Hello!

I am creating a document where users select a checkbox based on their rankings/ratings within a certain topic.  I have assigned each checkbox a value. 

I am trying to take those values, and divide them by 4.  My script reads:

var v1 = Number(this.getField(“DEI-AN1”).value);

var v2 = Number(this.getField(“DEI-AN2”).value);

var v3 = Number(this.getField(“DEI-AN3”).value);

var v4 = Number(this.getField(“DEI-AN4”).value);

var v5 = Number(this.getField(“DEI-RI1”).value);

var v6 = Number(this.getField(“DEI-RI2”).value);

var v7 = Number(this.getField(“DEI-RI3”).value);

var v8 = Number(this.getField(“DEI-RI4”).value);

var v9 = Number(this.getField(“DEI-S1”).value);

var v10 = Number(this.getField(“DEI-S2”).value);

var v11 = Number(this.getField(“DEI-S3”).value);

var v12 = Number(this.getField(“DEI-S4”).value);

var v13 = Number(this.getField(“DEI-OF1”).value);

var v14 = Number(this.getField(“DEI-OF2”).value);

var v15 = Number(this.getField(“DEI-OF3”).value);

var v16 = Number(this.getField(“DEI-OF4”).value);

var v17 = Number(this.getField(“DEI-AA1”).value);

var v18 = Number(this.getField(“DEI-AA2”).value);

var v19 = Number(this.getField(“DEI-AA3”).value);

var v20 = Number(this.getField(“DEI-AA4”).value);

event.value=(v1+v2+v3+v4+v5+v6+v7+v8+v9+v10+v11v+v12+v13+v14+v15+v16+v17+v18+v19+v20/4;

I keep getting error messages. At first it was syntax, now it's illegal character (I've been playing with it for a few days trying to figure it out).  Any help would be greatly appreciated.