Getting errors on my chart script

Hello unity! So in my Chartboost script i keep getting errors about "expected semicolon" "Unexpected Token" Etc. I read the documentation and copied everything from there but i do not know why im getting these errors. Here is my script like for example on the first line that says "using Chartboost;" it tells me to put semicolon for whoever knows the reason why. EDIT: Now Im getting a parsing error which i do not know what that means heres the updated script EDIT2: I fixed it

 using UnityEngine;
 using System.Collections;
 using Chartboost;
 
 public class Chart : MonoBehaviour {
 
     void OnEnable() {
         // Initialize the Chartboost plugin
         
         // Replace these with your own Android app ID and signature from the Chartboost web portal
         CBBinding.init("CB_APP_ID_ANDROID", "CB_APP_SIG_ANDROID");
     }
     
     
     void OnApplicationPause(bool paused) {
         // Manage Chartboost plugin lifecycle
         CBBinding.pause(paused);
     }
     
     void OnDisable() {
         // Shut down the Chartboost plugin
         CBBinding.destroy();
     }
     
     
     
     public void Update() {
         if (Input.GetKeyUp(KeyCode.Escape)) {
             if (CBBinding.onBackPressed())
                 return;
             else
                 Application.Quit();
         }
     }