need help with mouse scroll wheel input

the following script is the one I’m having trouble with.
when i scroll up, i should be able to see the “selectedWeapon” value icrease in the unity editor. But i don’t. Is there something i’m missing? idk, please help
by the way, am I the only one whose questions dissappear after a day or so after asking?

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

public class Weapons : MonoBehaviour {

    public int selectedWeaopon = 0;

    // Use this for initialization
    void Start ()
        if (Input.GetAxis("Mouse ScrollWheel") > 0f)
            selectedWeaopon += 1;        
	// Update is called once per frame
	void Update () {

Yeah, it’s because you put your if statement in the start function