How to fix error cs1519?

Question

C++ / C#

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class mainMENU : MonoBehaviour
{
    [SerializeField] int money;
    public Text moneyText;
    public void ButtonClick();
    public bool isMulti = false;
    {
        money++;
    }

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

        moneyText.text = "вы погладили леона: " + money.ToString() + " раз";
    }
    public void BuyMulti()
    {
        if (money >= 100 && isMulti == false)
        {
            isMulti = true;
            money -= 100;
            PlayerPrefs.SetInt("Money",money);
            PlayerPrefs.SetInt("isMulti",isMulti ? 1 : 0);
        }
    }
    if (isMulti == true)
    {
        money += 1000;
    }
}

Gives the following error:

Answer 1

Your brackets are crooked.
And it is specific at you if outside of a method - most likely the superfluous closing bracket.
If you press the "format document" button, you can even visually see where everything breaks