how use specific for mobile button when we have 3 ?

Hi every body, i have a menu, in this menu i have 3 buttons (Play, Settings, Quit) and i want when use specific button when i touch the button on my mobile screen . i give this script for the 3 buttons, the problem is when i clik on Play the game quit, help me please .

using UnityEngine;
using System.Collections;

public class NewBehaviourScript402 : MonoBehaviour {

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {

	Touch touch = Input.GetTouch(s);
	
	if(touch.phase == TouchPhase.Began)

	{
		Application.LoadLevel("Jeu");
	}

}

}

You need to check where on the screen the user taps. When you know that, you can work out which button has been pressed.

Us the new UI system in unity, it handles the touch for you. Just make a Play method

public void Play(){
 Application.LoadLevel("Jeu");
}

and a settings a quit method. Call those from the buttons built in “OnClick” event.