Make Game end after 5 Deaths?

Hi,
I'm making a game wiht a rollerball and want it to end after 5 deaths.
Also I want to have the amount of deaths and tries that are left shown on screen.
I've got some ideas how to achieve that but my coding skills are very limited (bad) so maybe someone can help me out:

Code (CSharp):

1.     using System.Collections;
2.     using System.Collections.Generic;
3.     using UnityEngine;
4.    
5.     public class Leben : MonoBehaviour {
6.         public UnityEngine.UI.Text Falls;
7.         public UnityEngine.UI.Text Lifes;
8.    
9.         void Start () {
10.    
11.         }
12.    
13.         void Update () {
14.             Fall0ut = if transform.position.y < -200    
15.                 int counter = 0;
16.             While (counter < 5) {
17.                 counter++;
18.                 Debug.Log(counter);
19.             }
20.    
21.             Life0ut = if transform.position.y < -200
22.                 int counter = 5;
23.             While (counter > 0) {
24.                 counter--;
25.                 Debug.Log(counter);
26.             }
27.    
28.             Falls.text = Fall0ut.ToString();
29.             Lifes.text = Life0ut.ToString();    
30.         }
31.     }
32.    
33.