how to make int random number

hey there im trying to make a random tree spawner script and was wondering how i could make the "number" int random i tried to o it like i did with the x and z int any help would be much appreciated.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class randomspawn : MonoBehaviour
{
    public GameObject tree;
    public int number;
    public int yaxis;

    void Start()
    {
        PlaceTree();
    }
    void PlaceTree()
    {
        for (int i = 0; i < number; i++)
        {
            Instantiate(tree, GeneratedPosition(), Quaternion.identity);
        }
    }



    Vector3 GeneratedPosition()
    {
        int x, y, z;
        x = Random.Range(-1000, 1000);
        y = UnityEngine.Random.Range(-yaxis, yaxis);
        z = Random.Range(-1000, 1000);
        return new Vector3(x, y, z);

    }
}