C# Mouse Look (Input.GetAxis("MouseX&Y"))

Hello. I would like to know, how to replace "Input.GetAxis("MouseX")" and "Input.GetAxis("MouseY")" in C#. I do not want to use those Axises. I want to know how to detect mouse movement in X & Y directions. I tried "mousePosition", but it gives me not more, than the position of the mouse. I need movement(Up or Down, Right or Left). For excample: Input.GetAxis("Horisontal") can be changed to Input.GetKey(KeyCode.A) & Input.GetKey(KeyCode.D). Trying to make Mouse Look C# script, without "Input.GetAxis("MouseX")" and "Input.GetAxis("MouseY")". Simiular to this one:

 using UnityEngine;
 using System.Collections;
 
 public class Cam2 : MonoBehaviour {
     
     public enum RotationAxes { MouseXAndY = 0, MouseX = 1, MouseY = 2 }
     public RotationAxes axes = RotationAxes.MouseXAndY;
     public float sensitivityX = 15F;
     public float sensitivityY = 15F;
     
     public float minimumX = -360F;
     public float maximumX = 360F;
     
     public float minimumY = -60F;
     public float maximumY = 60F;
     
     float rotationX = 0F;
     float rotationY = 0F;
     
     Quaternion originalRotation;
     
     void Update ()
     {
         if (axes == RotationAxes.MouseXAndY)
         {
             // Read the mouse input axis
             rotationX += Input.GetAxis("Mouse X") * sensitivityX;
             rotationY += Input.GetAxis("Mouse Y") * sensitivityY;
             
             rotationX = ClampAngle (rotationX, minimumX, maximumX);
             rotationY = ClampAngle (rotationY, minimumY, maximumY);
             
             Quaternion xQuaternion = Quaternion.AngleAxis (rotationX, Vector3.up);
             Quaternion yQuaternion = Quaternion.AngleAxis (rotationY, -Vector3.right);
             
             transform.localRotation = originalRotation * xQuaternion * yQuaternion;
         }
         else if (axes == RotationAxes.MouseX)
         {
             rotationX += Input.GetAxis("Mouse X") * sensitivityX;
             rotationX = ClampAngle (rotationX, minimumX, maximumX);
             
             Quaternion xQuaternion = Quaternion.AngleAxis (rotationX, Vector3.up);
             transform.localRotation = originalRotation * xQuaternion;
         }
         else
         {
             rotationY += Input.GetAxis("Mouse Y") * sensitivityY;
             rotationY = ClampAngle (rotationY, minimumY, maximumY);
             
             Quaternion yQuaternion = Quaternion.AngleAxis (-rotationY, Vector3.right);
             transform.localRotation = originalRotation * yQuaternion;
         }
     }
     
     void Start ()
     {
         // Make the rigid body not change rotation
         if (rigidbody)
             rigidbody.freezeRotation = true;
         originalRotation = transform.localRotation;
     }
     
     public static float ClampAngle (float angle, float min, float max)
     {
         if (angle < -360F)
             angle += 360F;
         if (angle > 360F)
             angle -= 360F;
         return Mathf.Clamp (angle, min, max);
     }
 }