SELECT count(*) FROM (SELECT * FROM endowment WHERE amount  >  8.5 GROUP BY school_id HAVING count(*)  >  1)
Find the number of schools that have more than one donator whose donation amount is less than 8.5.
[Schema (values) (types)]: | school_finance |  School : school_id (text) , school_name (text) , location (text) , mascot (text) , enrollment (text) , ihsaa_class (number) , ihsaa_football_class (text) , county (text) | budget : school_id (text) , year (text) , budgeted (text) , total_budget_percent_budgeted (text) , invested (text) , total_budget_percent_invested (number) , budget_invested_percent (text) | endowment : endowment_id (text) , school_id (text) , donator_name (text) , amount (text);