Error CS1041:Identifier Expected?

using UnityEngine;
using System.Collections;

public class Level : MonoBehaviour {
var exp= 0;
var expNeeded= 50;
var level= 1;
Texture currentLevelSymbol;
Texture level1symbol;
Texture level2symbol;
Texture level3symbol;
Texture level4symbol;
Texture level5symbol;
 
void  Start (){
    expNeeded = 50;
}
 
void  Update (){
    AddjustCurrentExp(0);
 
    if(exp >= expNeeded){
        exp = 0;
        level += 1;
    }
 
    if(level >= 1){
        currentLevelSymbol = level1symbol;
        expNeeded = 50;
    }
    if(level == 2){
        currentLevelSymbol = level2symbol;
        expNeeded *= 2;
    }
    if(level == 3){
        currentLevelSymbol = level3symbol;
        expNeeded *= 2;
    }
    if(level == 4){
        currentLevelSymbol = level4symbol;
        expNeeded *= 2;
    }
    if(level == 5){
        currentLevelSymbol = level5symbol;
        expNeeded *= 2;
    }
}
 
void  AddjustCurrentExp (adj){
    exp += adj;
}
 
void  OnGUI (){
    GUI.DrawTexture( new Rect(10,10,70,70), currentLevelSymbol, ScaleMode.ScaleToFit, true);
}
}

it says theres an error in “void AddjustCurrentExp (adj)”
can anyone help me?

You are missing int

void  AddjustCurrentExp (int adj){
    exp += adj;
}