HELP !!!increase/decrease local position with mouse click

I need help with my script, I can not make the cube move in + 1.0 in relation to its initial position.
cube current position: x -2, y 0 , z -1 (this is just a example of his position).
by clicking on the object with the tag "CIMA" , the position z must increase by +1, and clicking on the object with the tag "BAIXO" decrease z position in -1.
my script in C #
using UnityEngine;
using System.Collections;

public class regraBlocos : MonoBehaviour {
private Vector3 iniPOS;
private bool blocoAtivo = true;
private bool blocoPressionado = false;
private bool setaCima = false;
private bool setaDireita = false;
private bool setaBaixo = false;
private bool setaEsquerda = false;
public Texture2D buttonArt;
// Use this for initialization
void Start () {
iniPOS = transform.localPosition;
}

// Update is called once per frame
void Update()
{
if (Input.GetMouseButtonDown(0) blocoAtivo ==true)
{

RaycastHit hitInfo = new RaycastHit();
bool hit = Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hitInfo);
if (hit)
{
if (hitInfo.transform.gameObject.tag == "BLOCO" blocoAtivo ==true)
{blocoPressionado = true;}
if (hitInfo.transform.gameObject.tag == "CIMA" blocoAtivo ==true)
{setaCima = true;}
if (hitInfo.transform.gameObject.tag == "DIREITA" blocoAtivo ==true)
{setaDireita = true;}
if (hitInfo.transform.gameObject.tag == "BAIXO" blocoAtivo ==true)
{setaBaixo = true;}
if (hitInfo.transform.gameObject.tag == "ESQUERDA" blocoAtivo ==true)
{setaEsquerda = true;}
}
if(setaCima ==true){
iniPOS.x =+1;
//iniPOS.y =+0;
//iniPOS.z =+0;
transform.localPosition = iniPOS;
}
}
}
}

 

if (hitInfo.transform.gameObject.tag == "CIMA" blocoAtivo ==true)
transform.position = new Vector3(transform.position.x, transform.position.y, transform.position.z + 1.0f);

 

thanks man its work!