Need help getting this code to work

Question

I am trying to get this code to work using "if else statment" but it will only do the first part and not do the second part in the else statement. Can anyone help me out? Here is the code:
var R1 = this.getField("Registration Fees1");
var R2 = this.getField("Registration Fees2");
var R3 = this.getField("Registration Fees3");
var R4 = this.getField("Registration Fees4");
var R0 = 0
if (R0 == 0)
  event.value = Math.floor(R1.value);
else
  event.value = Math.floor(R2.value + R3.value + R4.value);
I did notice that if I fiddled around this this part:
if (R0 == 0)
sometimes I can get the second part to work but not the first. I need it to do either or and this is getting frustrating.
I might also not even need "var R0 = 0". I put that there for the condition part. If that is what is causing the problem, I can take it out. But then what would the condition be? For this form, the default is 0 and then the calculation follows by user clicking on different prices. The first part is if they want to pay for the full conference and the second part is if they want to pay for either Monday, Tuesday or Wednesday or 2 of the 3 days. Is it possible to get this to work with both parts together? I am still stuck on getting just one or the other working. Any help would be greatly appreciated. Thanks in advance.

Answer 1

I have posted this on another message board and a user by the name of gkaiseril offered this solution but it hasn't worked either.
// all four days
var R1 = this.getField("Registration Fees1").value;
// Monday
var R2 = this.getField("Registration Fees2").value;
// Tuesday
var R3 = this.getField("Registration Fees3").value;
// Wednesday
var R4 = this.getField("Registration Fees4").value;
var Fee = 0
event.value = ''; // default value
if (R1 != 'Off') {
  Fee = Number(R1) + Fee;
} else {
  if(R2 != 'Off') {
     Fee = Number(Fee) + R2;
  if(R3 != 'Off') {
     Fee += Number(R3);
  if(R4 != 'Off') {
     Fee = Number(R4) + Fee;
event.value = Fee;