cannot be applied to operands

Hey! so i got this script:

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
 
 namespace HB.Snowboarding
 {
 
 public class NewBehaviourScript : MonoBehaviour {
 
     private PhysicsCharacterState m_ghostPhysicsCharacterState;
     private float m_railBoardPressThreshold;
     private float m_boardPressThreshold;
         private bool m_useSwitchControls;
 
     // Use this for initialization
     void Start () {
         
     }
     
     // Update is called once per frame
     void Update () {
         
     }
 
         public PhysicsCharacterState CharacterState
         {
             get
             {
                 return this.CharacterState;
             }
         }
 
         private void SetTurnBehavior(float inputAngle, Quadrant initialQuadrant)
         {
             bool onRail = this.CharacterState.onRail;
             float num = (!onRail) ? this.m_boardPressThreshold : this.m_railBoardPressThreshold;
             if (initialQuadrant == null || initialQuadrant == 3)
             {
                 if (inputAngle < num || inputAngle > 360f - num)
                 {
                     this.CharacterState.turnBehavior = ((!this.m_useSwitchControls) ? TurnBehavior.NosePress : TurnBehavior.TailPress);
                 }
                 else
                 {
                     this.CharacterState.turnBehavior = TurnBehavior.Carve;
                 }
             }
             else if (initialQuadrant == 1 || initialQuadrant == 2)
             {
                 if (inputAngle > 180f - num && inputAngle < 180f + num)
                 {
                     this.CharacterState.turnBehavior = ((!this.m_useSwitchControls) ? TurnBehavior.TailPress : TurnBehavior.NosePress);
                 }
                 else
                 {
                     this.CharacterState.turnBehavior = TurnBehavior.Carve;
                 }
             }
             else
             {
                 this.CharacterState.turnBehavior = TurnBehavior.Carve;
             }
         }
 
     }
 }
 

which is giving me the following error:
error CS0019: Operator ==' cannot be applied to operands of type Quadrant' and `int'

the Quadrant gets calculated like this:

 public static Quadrant GetQuadrant(Vector2 v)
     {
         v = v.normalized;
         float angle = Utilities.Normalize360(Mathf.Atan2(v.y, v.x) * 57.29578f);
         return Utilities.GetQuadrant(angle);
     }
 
     public static Quadrant GetQuadrant(float angle)
     {
         Quadrant result = Quadrant.None;
         angle = Utilities.Normalize360(angle);
         if (angle <= 90f)
         {
             result = Quadrant.I;
         }
         else if (angle <= 180f)
         {
             result = Quadrant.II;
         }
         else if (angle <= 270f)
         {
             result = Quadrant.III;
         }
         else if (angle <= 360f)
         {
             result = Quadrant.IV;
         }
         else
         {
             UnityEngine.Debug.LogWarning("Undefined Quadrant!");
         }
         return result;
     }

and has this enums:

 using System;
 
 public enum Quadrant
 {
     None = -1,
     I,
     II,
     III,
     IV
 }
 

when i write the first script like this:

 private void SetTurnBehavior(float inputAngle, Quadrant initialQuadrant)
         {
             bool onRail = this.CharacterState.onRail;
             float num = (!onRail) ? this.m_boardPressThreshold : this.m_railBoardPressThreshold;
             if (initialQuadrant == Quadrant.None || initialQuadrant == Quadrant.III)
             {
                 if (inputAngle < num || inputAngle > 360f - num)
                 {
                     this.CharacterState.turnBehavior = ((!this.m_useSwitchControls) ? TurnBehavior.NosePress : TurnBehavior.TailPress);
                 }
                 else
                 {
                     this.CharacterState.turnBehavior = TurnBehavior.Carve;
                 }
             }
             else if (initialQuadrant == Quadrant.I || initialQuadrant == Quadrant.II)
             {
                 if (inputAngle > 180f - num && inputAngle < 180f + num)
                 {
                     this.CharacterState.turnBehavior = ((!this.m_useSwitchControls) ? TurnBehavior.TailPress : TurnBehavior.NosePress);
                 }
                 else
                 {
                     this.CharacterState.turnBehavior = TurnBehavior.Carve;
                 }
             }
             else
             {
                 this.CharacterState.turnBehavior = TurnBehavior.Carve;
             }
         }

everything is fine. but out of convenience i would like to keep the "initialQuadrant == 3" instead of "initialQuadrant == Quadrant.III"

does anyone of you have a solution for this?