Can't Route data from Arduino into Max

Another question in the same subject:
I try to send multiple messages from MaxMSP to arduino in order to control 4 different relays.

I manage to send data from max into arduino and turn a relay on and off. I can't find a way how can I send 4 different messages from max to Arduino in order to control 4 different relays.
What I have now that is working is that max patch:

with the following arduino code:

int relayOne = 2;
void setup()
{
  Serial.begin(9600);
  pinMode(relayOne,OUTPUT);
}
void loop()
{
  dataFromMax();
}
void dataFromMax()
{
  if (Serial.available()) {
    int value1 = Serial.read();
    if(value1 == 1){
      digitalWrite(relayOne, HIGH);
    }
    else if (value1 == 0){
      digitalWrite(relayOne, LOW);
    }
  }
}

how can I expand the code above to control 4 messages of 0 and 1 from max to turn on and off 4 different relays modules? The max patch should look something like that:

make as many if statements to match as many needed values.

if xx == 1 then
if xx == 2 then
if xx == 3 then
and so on.

How do I send those values from Max to arduino? using the pad object?

and in Arduino?

int relayOne = 2;
int relayTwo = 3;
int relayThree = 4;
void setup()
{
  Serial.begin(9600);
  
  pinMode(relayOne,OUTPUT);
  pinMode(relayTwo,OUTPUT);
  pinMode(RelayThree,OUTPUT);

}
void loop()
{
  dataFromMax();
}
void dataFromMax()
{
  if (Serial.available()) {
    int value1 = Serial.read();
    int value2 = Serial.read();
    int value3 = Serial.read();
    if(value1 == 1){
      digitalWrite(relayOne, HIGH);
    }
    else if (value1 == 0){
      digitalWrite(relayOne, LOW);
    }
     if(value2 == 1){
      digitalWrite(relayTwo, HIGH);
    }
    else if (value2 == 0){
      digitalWrite(relayTwo, LOW);
    }
    if(value3 == 1){
      digitalWrite(relayThree, HIGH);
    }
    else if (value3 == 0){
      digitalWrite(relayThree, LOW);
    }
  }
}

do you have trouble assigning 6 numbers ?
for example :
relay 1 send 1 or 0
relay 2 send 2 or 3
relay 3 send 3 or 4
or any other number.
you don't know how to use some max object to
convert toggle 1 and 0 to other 2 numbers ?

I know that method:

The issue I might face is - What happen if both relay sending data at the same time? in that case one of the data won't send? or will be send in delay?

edit: 
and here is the Arduino patch:

int relayOne = 2;
int relayTwo = 3;
int relayThree = 4;
void setup()
{
Serial.begin(9600);

pinMode(relayOne,OUTPUT);
pinMode(relayTwo,OUTPUT);
pinMode(relayThree,OUTPUT);

}
void loop()
{
dataFromMax();
}
void dataFromMax()
{
if (Serial.available()) {
int value1 = Serial.read();
if(value1 == 0){
digitalWrite(relayOne, LOW);
}
else if (value1 == 1){
digitalWrite(relayOne, HIGH);
}
if(value1 == 2){
digitalWrite(relayTwo, LOW);
}
else if (value1 == 3){
digitalWrite(relayTwo, HIGH);
}
if(value1 == 4){
digitalWrite(relayThree, LOW);
}
else if (value1 == 5){
digitalWrite(relayThree, HIGH);
}
}
}


it is indeed working fine, Just wondering if there is smarter/efficent way to do the above without the need to write so many if(value1 == ){} else if and so one

what is wrong with so many if's ?

you dont need else, only 6 if statements

what is wrong with so many if's ?
you dont need else, only 6 if statements

Generally - nothing wrong, is just that I'm thinking what if I would like to send 20 signals from max msp to arduino to control 20 different objects with arduino (LEDs, Relay, etc) it will soon become messy.
This is why I'm asking about more elegant way of doing so.

You will need to learn how to parse serial data.
because you might need more than just 255 numbers
and also more than just on - off state.

But at the end - if you want to control anything individually
in arduino using serial port, you must address it.
either you name it and talk to it,
or you send a list of values, and respond to position in the list.
depends on timing of controls.

Thanks. Do you have any book or reading recommendation on that topic? or even recommendation reading for arduino programming?