passing variables through scripts

Hello, i've got main code called head. It got inside:

 public class head : MonoBehaviour
 {
 public static int lang = 0;
 public static int score=0;
 }

I want to connect two scripts to it - menu and deathScore

 public class menu : MonoBehaviour
 {
 public int language = 0;
 void Start()
 {
 head.language=language;//take language number from "head" script
 }
 }

and second script - deathScore

public class deathScore : MonoBehaviour

{

int hp=100;

void Update()

{

if(hp<=0)

{

head.score =+ 1;//add +1 to head's score

}

} }

and I've got errors:

Head: error CS0120: An object reference is required to access non-static member menu.language' > Head error CS1061: Type int' does not contain a definition for score' and > no extension method score' of type `int' could be found (are you missing a using directive or an assembly reference?)

What I did wrong?