player pref load?

how do i load the info from player pref once the player have left the game and opened it again?

GameSystem.Cs

using UnityEngine; using System.Collections; using System; using System.Text; using System.IO; using System.Collections.Generic;

public class GameSystem : MonoBehaviour {

 static public int ruby1;
 static public int sapphire1;
 static public int emerald1;
 static public int hellStone1;
 static public int token1;
 static public bool jetpack1;
 
 void Start()    
 {
     ruby1 = PlayerPrefs.GetInt ("Ruby"); 
     sapphire1 = PlayerPrefs.GetInt ("Sapphire");
     emerald1 = PlayerPrefs.GetInt ("Emerald"); 
     hellStone1 = PlayerPrefs.GetInt ("HellStone"); 
     token1 = PlayerPrefs.GetInt ("Token"); 
 //    jetpack1 = PlayerPrefs.GetInt ("Jetpack");
 }
 
 

}

GameProfile.Cs

using UnityEngine; using System.Collections; using System; using System.Text; using System.IO; using System.Collections.Generic;

public class GameProfile : MonoBehaviour { static public int ruby = GameSystem.ruby1;

 static public int sapphire = GameSystem.sapphire1;
 
 static public int emerald = GameSystem.emerald1;
 
 static public int hellStone = GameSystem.hellStone1;
 
 static public int token = GameSystem.token1;
 
 static public bool jetpack = GameSystem.jetpack1;    
 

 
 void Update ()
 {
     if (ruby != PlayerPrefs.GetInt("Ruby"))
     {
         PlayerPrefs.SetInt ("Ruby",ruby);
     }
     if (sapphire != PlayerPrefs.GetInt("Sapphire")) 
     {
         PlayerPrefs.SetInt ("Sapphire",sapphire);
     }
     if (emerald != PlayerPrefs.GetInt("Emerald"))
     {
         PlayerPrefs.SetInt ("Emerald",emerald);
     }
     if (hellStone != PlayerPrefs.GetInt("HellStone"))
     {
         PlayerPrefs.SetInt ("HellStone",hellStone);
     }
     if (token != PlayerPrefs.GetInt("Token"))
     {
         PlayerPrefs.SetInt ("Token",token);
     }
     
     PlayerPrefs.Save();
     /*    if (ruby != PlayerPrefs.GetInt("Jetpack")) 
     {
         PlayerPrefs.SetInt ("Jetpack",jetpack);
     }*/
 }
 

}

in another script i edit the variables but i dont know how to load them ... in what script , in that function .. i dont like answer with the part i need whitout any instruction because im too dumb to understand what happen next ... i need to know what scrip and where to put it :/

thx for the help

thx to gramefreak and Dave A for this part of playerpref done ... also how do i save and load bools?