Update int value with photon rpc?

Example scenario: the room is set up and the scene starts when the actors are ready. I have an int value called x, I increment x by 1 when players click a button. When all 4 players press this button, the x value reaches 4. And if the number of players in the room and the x value are equal, I load a new object on the stage. I thought I should do this with rpc but failed. i am sending you my code file:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using Photon;
 using Photon.Pun;
 using Photon.Realtime;
 using Photon.Voice;
 
 public class kontrolonline : MonoBehaviourPunCallbacks
 {
     public int x;
 
 
 
 
     public void one()
     {
             
         photonView.RPC("KacOldu", RpcTarget.OthersBuffered, x);
         KacOldu(x);
         
         if (PhotonNetwork.CurrentRoom.PlayerCount == x)
         {
         GameObject izle = PhotonNetwork.Instantiate("webview", Vector3.zero, Quaternion.identity, 0, null);

         }
 
     }
     
     
 
     [PunRPC]
     private void KacOldu(int x)
     {
 
         x=+ 1;
         Debug.Log("?",x);
     }
 
     public void Start()
     {    
         kaç = 0;
         //    GameObject kaç = PhotonNetwork.Instantiate("kaç", Vector3.zero, Quaternion.identity, 0, null);
 
     }
     
 
 }

Result : the value of x does not increase by 1 when the player clicks the button. So x is never equal to the number of players in the room. Where do you think I went wrong, could you please tell me?