Ne ho cinque. Ho avuto means I have, I have had, or I did have . These verbs that are conjugated with essere must agree with the subject. Irregular past participles are in parentheses. If you make the verb negative, the non goes before the entire verb .
Pronouns go before the entire verb as well, but after the non.
I haven't eaten. Non ho mangiato. I haven't eaten it. Ne ho mangiato quattro. I ate it.