count how much force is applied

In my sample game there is 1 wall and 4 players. The player is moving on x axis and z axis. Wall has a Box Collider and Rigidbody and set the Mass = 4. Player also has a Box Collider and Rigidbody and set the Mass = 1.

When I move the player to the wall the unity physics engine apply the force to the wall and a wall move slightly towards the force direction. When 2 Players simultaneously force the wall move its position accordingly and so fourth.

What I want is I want the output in debug console how many players are applying a force to the wall.

for example: If the one player is applying the force to the wall then output should be Player =1; if the two player is applying the force to the wall then output should be Player =2; if the three player is applying the force to the wall then output should be Player =3; if the four player is applying the force to the wall then output should be Player =4;

Here is my MoveScript and a Screenshot of my Setup:

MoveScript

 using UnityEngine;
 using System.Collections;
 
 public class MoveScript : MonoBehaviour {
 
     public float speed = 2.0f;
 
     void Update () {
         Vector3 move = new Vector3 (Input.GetAxis("Horizontal"),0,Input.GetAxis("Vertical"));
         transform.position = transform.position + move * speed * Time.deltaTime;
 
 
     }
 }

here is a screen shot of my setup