Vector3 Error?

Assets/Standard Assets/Character Controllers/Sources/Scripts/JetPack.js(11,32): BCE0024: The type 'UnityEngine.Vector3' does not have a visible constructor that matches the argument list '(int, int, float, int)'.

here's my code:

 #pragma strict
 var cm : CharacterMotor;
 var jetpack : AudioClip;
 private var thisAudio : AudioSource;
 function Start(){
 cm = GetComponent("CharacterMotor");
 thisAudio = GetComponent("AudioSource");
 }
 function Update(){
 if(Input.GetKeyDown("left shift")){
 cm.movement.velocity += Vector3(0,1,1f,0);
 thisAudio.clip = jetpack;
 if (!thisAudio.isPlaying)
 thisAudio.Play();
 }
 if(Input.GetKeyUp("left shift")){
 thisAudio.Stop();
 }
 }