Item behavior

This is attached to the Pickup_Item prefab, as follows:

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

public class ItemBehavior : MonoBehaviour 
{
    public GameBehavior gm;

    void Start()
    {
        gm = GameObject.Find("Game Manager").GetComponent<GameBehavior>();
    }

    void OnCollisionEnter(Collision collision)
    {
        if (collision.gameObject.name == "Player")
        {
            Destroy(this.transform.parent.gameObject);
            Debug.Log("Item collected!");

            gm.Items += 1;
        }
    }
}