Raycast!

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class sas : MonoBehaviour
{
    // Start is called before the first frame update

    public Material m1;

    public int score_eag;
    public int score_psheno;
    public int score_milk;
    public int ALL_MONEY;

    public GameObject chiken;
    public GameObject cow;
    public GameObject field;

    public Text scoretext1;
    public Text scoretext2;
    public Text scoretext3;
    void Start()
    {

    }

    // Update is called once per frame
    void FixedUpdate()
    {

        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit) && Input.GetMouseButtonDown(0))
        {
            if (hit.collider.tag == "chiken")

            {
                score_eag += 1;
                ALL_MONEY += 15;
                chiken.gameObject.GetComponent<Renderer>().material = m1;
                scoretext1.text = "eag:" + score_eag;

            }


            if (Physics.Raycast(ray, out hit) && Input.GetMouseButtonDown(0))

                if (hit.collider.tag == "cow")

                {
                score_psheno += 1;
                    ALL_MONEY += 40;
                    chiken.gameObject.GetComponent<Renderer>().material = m1;
                    scoretext2.text = "milk:" + score_milk;
                }


                if (Physics.Raycast(ray, out hit) && Input.GetMouseButtonDown(0))

                    if (hit.collider.tag == "field")

                  {
                     score_milk += 1;
                    ALL_MONEY += 20;
                    scoretext3.text = "field:" + score_psheno;
                    chiken.gameObject.GetComponent<Renderer>().material = m1;
            }


        }
    }