Subtraction from multiple fields result is incorrect.

I have been attempting to calculate a subtraction javascript in acrobat X. (i am an inexperienced javascript coder and found part of this this in a search online.  I made some assumptions and elaborated the rest)

This is my javascript:

// Get first field value

var v1 = getField("Qty Recd").value;

// Get second field value

var v2 = getField("Text4.0.1").value;

// Get third field value

var v3 = getField("Text4.1.1").value;

// Get fourth field value

var v4 = getField("Text4.2.1").value;

// Get fifth field value

var v5 = getField("Text4.3.1").value;

// Get sixth field value

var v6 = getField("Text4.4.1").value;

// Get seventh field value

var v7 = getField("Text4.5.1").value;

// Get eighth field value

var v8 = getField("Text4.6.1").value;

// Get ninth field value

var v9 = getField("Text4.7.1").value;

// Get tenth field value

var v10 = getField("Text4.8.1").value;

// Get eleventh field value

var v11 = getField("Text4.9.1").value;

// Set this field value equal to the difference

event.value = v1-v2;-v3;-v4;-v5;-v6;-v7;-v8;-v9;-v10;-v11;-v12;-v13;-v14

When I test the calculation, initially the result is correct.  However, when I change one of the values to another number or delete it, the result continues to subtract what was initially entered in the field.  How do I correct this?  .

I have been trying different things and searching for help for two days.

Can anyone figure out what I am doing wrong?  And then help me correct it?

Thank you Emelone