private bool grounded = true;
 public float jumpPower = 190;
 public float Power = 10f;
 private bool hasJumped = false;
 public Rigidbody rb;
 // Use this for initialization
 void Start () 
 {
     rb = GetComponent<Rigidbody>();
 }
 // Update is called once per frame
 void Update () 
 {
     // Do something
     if(!grounded && rb.velocity.y == 0) {
         grounded = true;
     }
     if (Input.GetKey (KeyCode.W) && grounded == true) {
         hasJumped = true;
     }
     if (Input.GetKey(KeyCode.D))
     {
         transform.Translate(Vector3.right * Power * Time.deltaTime, Space.World);
             
     }
     if (Input.GetKey(KeyCode.A))
     {
         transform.Translate(Vector3.right * -Power * Time.deltaTime, Space.World);
     }
 }
 void FixedUpdate (){
     if(hasJumped){
         rb.AddForce (transform.up*jumpPower);
         grounded = false;
         hasJumped = false;
     }
 }