Inverting the cutoff property (UI bar)

Hi, I'm making a sprite based hud in my game, and I'm using the cutoff shader to get the bars working, the problem is that the cutoff property is "inverted" in some way, like when it's at 0, it shows everything, and when it's at 1, it shows nothing, and I want the exact opposite (e.g. if I have 100 hp I want it to draw the whole bar, if I have 0 I want it to draw nothing).

Here is my current code for the bar:

     float energyQuanitity = EnergyBar.GetFloat("_Cutoff");
     energyQuanitity = Mathf.Lerp(energyQuanitity, EnergyScript.energy/100f, lerpSpeed * Time.deltaTime);
     EnergyBar.SetFloat("_Cutoff", energyQuanitity);

and here's the full script:

 using UnityEngine;
 using System.Collections;
 
 public class HudScript : MonoBehaviour {
 
     public float lerpSpeed = 10f;
 
     public Color FirstColor = Color.black;
     public Color SecondColor;
     Color currentColor;
     public GUITexture vignette;
 
     public Material EnergyBar;
     public Material TemperatureBar;
 
     void Start () {
         currentColor.a = 1f;
     }
 
     void Update () {
         currentColor = Color.Lerp(FirstColor, SecondColor, GameManager.temperatureChange/30f);
         vignette.color = currentColor;
         
         TemperatureBar.SetFloat("_Cutoff", GameManager.temperatureChange/30f);
 
         float energyQuanitity = EnergyBar.GetFloat("_Cutoff");
         energyQuanitity = Mathf.Lerp(energyQuanitity, EnergyScript.energy/100f, lerpSpeed * Time.deltaTime);
         EnergyBar.SetFloat("_Cutoff", energyQuanitity);
     }
 }

Thanks in advance.