def howManyGames(p, d, m, s)

    price = p
    discount = d
    money = s
    games = 0
    while money >= price
        money = money - price # paid one game
        games = games + 1 # got one game
        price = price - discount # price is reduced by promotion
        price = price > m ? price : m # until it reaches a bottom limit
    end

    return games
end