How do I display the right score

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C#

UI

Unity3D

hey,

I am working on a game and trying to display the distance covered as the score. But despite the code written and debugged, the score is rising when I am moving to escape the obstacles. I want the score to increase according to the distance covered(in meters). And also I want the score to increase towards the x axis.

Here is the code that I have written.

using UnityEngine;
using UnityEngine.UI;

public class SCORE : MonoBehaviour
{
    public Transform player;
    public Text scoreText;

    void Update()
    {
        scoreText.text = player.position.z.ToString("0");
    }

}

What I have tried:

I have tried modifying the code as in the x axis in spite of y axis. Please help.