Just another Number Wizard

Here is my code. Nothing special as it is still early days, but I am finding the course great so far.

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

public class NumberController : MonoBehaviour
{
int maximum = 1000;
int minimum = 1;
int guess = 500;

// Start is called before the first frame update
void Start()
{
    Debug.Log("Goodmorning Dave, Would you like to play a game?");
    Debug.Log("The highest number you can pick is " + maximum);
    Debug.Log("The lowest number you can pick is " + minimum);
    Debug.Log("Tell me if your number is higher or lower than " + guess);
    Debug.Log("Push Up = Higher, Push Down = Lower, Push Enter = Correct");
    maximum = maximum + 1;
}

// Update is called once per frame
void Update()
{
    if (Input.GetKeyDown(KeyCode.UpArrow))
    {
        
        minimum = guess;
        guess = (maximum + minimum) / 2;
        Debug.Log("Is it higher or lower than..." + guess);
       
    }
    else if (Input.GetKeyDown(KeyCode.DownArrow))
    {

        maximum = guess;
        guess = (maximum + minimum) / 2;
        Debug.Log("Is it higher or lower than..." + guess);
   
    }
    else if (Input.GetKeyDown(KeyCode.Return))
    {
        Debug.Log("Enter was pressed. Yay!");
    }
}

}