Custom hello and slight code changes

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

public class NumberWizard : MonoBehaviour {
int max = 1000;
int min = 1;
int guess = 500;

// Use this for initialization
void Start ()
{
    Debug.Log("Welcome to Number Wizard, the number guessing game.");
    Debug.Log("First, I'll need you to pick a number between " + min + "and " + max);
    Debug.Log("Once you've picked your number, tell me if your number is higher or lower than " + (max + min) / 2);
    Debug.Log("Push the up arrow to choose higher, and push the down arrow to choose lower.");
    Debug.Log("If I've guess your number correctly, press enter.");
    max = max + 1;
}

// Update is called once per frame
void Update ()
{
    if (Input.GetKeyDown(KeyCode.UpArrow))
    {
        Debug.Log("Alright, so it was higher.");
        min = guess;
        guess = (max + min) / 2;
        Debug.Log("Is your number now higher or lower than " + guess + "?");
    }
    else if (Input.GetKeyDown(KeyCode.DownArrow))
    {
        Debug.Log("Ok, so it was lower.");
        max = guess;
        guess = (max + min) / 2;
        Debug.Log("Is your number now higher or lower than " + guess + "?");
    }
    else if (Input.GetKeyDown(KeyCode.Return))
    {
        Debug.Log("Yay!  I guessed your number correctly.");
    }
}

}