Read multiple sensor values independently from arduino to unity

Hello,

I have a project with arduino uno + 3 ultrasonic sensors in differents directions. I want to read the 3 values from my sensors in arduino and send them independently in Unity 3d to move 3 different 3d objets. How can i do this? Its already working with one ultra sensor, serial port and readline(), but with 3 values my script just read all the values and my object move in the 3 directions. I would like to choose which value move my object. Value 1, value 2 or value 3, and attach the others values to another objects. Thanks you community!

My unity code:

 using UnityEngine;
 using System.Collections;
 using System.IO.Ports;
 using System;
 
 
 public class simplePrintPort : MonoBehaviour 
 
 
 {
 
     public static SerialPort port = new SerialPort("/dev/cu.usbmodem641", 9600, Parity.None, 8, StopBits.One);
     public int sensorValue;
     public GameObject pushObject;
 
 
 
     // Use this for initialization
     void Start () {
 
         port.ReadTimeout = 100;
 
         if (!port.IsOpen)
         {
             try
             { 
                 
                 port.Open();
                 print ("Port is open");
                 
             }
             catch(TimeoutException)
             {
                 
             }
         }
         else
             Debug.LogError("Port already open.");
         
     }
 
 
     
     // Update is called once per frame
     void Update () {
     
 
         sensorValue = Convert.ToInt32(port.ReadLine());
         print (sensorValue);
 
 
 
         Vector3 temp = pushObject.transform.position;
         temp.z = (sensorValue/10);
         pushObject.transform.position = temp;
 
 
 
     
     }
 
 void OnDestroy()
 { 
     // Close the port when the program ends.
     if (port.IsOpen)
     {
         try
         { 
             port.Close();
         }
         catch(UnityException e)
         {
             Debug.LogError(e.Message);
         }
     }
 }
 }

My arduino code

 int ledPin1 = 13;
 int ledPin2 = 12;
 int ledPin3 = 11;
 
 int trigPin1 = 7;
 int echoPin1 = 8;
 
 int trigPin2 = 4;
 int echoPin2 = 5;
 
 int trigPin3 = 2;
 int echoPin3 = 3;
 
 
 void setup() {
   Serial.begin (9600);
   pinMode(trigPin1, OUTPUT);
   pinMode(echoPin1, INPUT);
   pinMode(trigPin2, OUTPUT);
   pinMode(echoPin2, INPUT);
   pinMode(trigPin3, OUTPUT);
   pinMode(echoPin3, INPUT);
 
   
 
   pinMode(ledPin1, OUTPUT);
   pinMode(ledPin2, OUTPUT);
   pinMode(ledPin3, OUTPUT);
 }
 
 void firstsensor(){ // This function is for first sensor.
   unsigned int duration1, distance1;
   digitalWrite (trigPin1, HIGH);
   delayMicroseconds (10);
   digitalWrite (trigPin1, LOW);
   duration1 = pulseIn (echoPin1, HIGH);
   distance1 = (duration1/2) / 29.1;
 
       Serial.print("1st Sensor: ");
       Serial.print(distance1);  
       Serial.print("cm    ");
 
   if (distance1 < 30) {  // Change the number for long or short distances.
     digitalWrite (ledPin1, HIGH);
   } else {
     digitalWrite (ledPin1, LOW);
   }    
 }
 
 void secondsensor(){ // This function is for first sensor.
   unsigned int duration1, distance1;
   digitalWrite (trigPin2, HIGH);
   delayMicroseconds (10);
   digitalWrite (trigPin2, LOW);
   duration1 = pulseIn (echoPin2, HIGH);
   distance1 = (duration1/2) / 29.1;
 
       Serial.print("2st Sensor: ");
       Serial.print(distance1);  
       Serial.print("cm    ");
 
   if (distance1 < 30) {  // Change the number for long or short distances.
     digitalWrite (ledPin2, HIGH);
   } else {
     digitalWrite (ledPin2, LOW);
   }    
 }
 
 void thirdsensor(){ // This function is for first sensor.
   unsigned int duration1, distance1;
   digitalWrite (trigPin3, HIGH);
   delayMicroseconds (10);
   digitalWrite (trigPin3, LOW);
   duration1 = pulseIn (echoPin3, HIGH);
   distance1 = (duration1/2) / 29.1;
 
       Serial.print("3st Sensor: ");
       Serial.print(distance1);  
       Serial.print("cm    ");
 
   if (distance1 < 30) {  // Change the number for long or short distances.
     digitalWrite (ledPin3, HIGH);
   } else {
     digitalWrite (ledPin3, LOW);
   }    
 }
 
 
 void loop() {
 Serial.println("\n");
 firstsensor();
 secondsensor();
 thirdsensor();
 delay(100);
 }