How do i get the enum value of an enum?

Example:

Enum.KeyCode.One has as enum value: 49

How do i get this value when i have the enum?

This way i can write the following code which is a lot shorter than the alternative

local function manageInventory(input, gameProcessed)
    local key = input.KeyCode - 48
    if 0 < key and key < 7  then
        if inventory["ViewportFrame"..key].BorderColor3 == unactiveColor then
            unselectAll()
            inventory["ViewportFrame"..key].BorderColor3 = activeColor
        else
            inventory["ViewportFrame"..key].BorderColor3 = unactiveColor
        end
    end
end