Forum:Chain Summoning grants 3 more summons additional or its only 3

"Chain Summoning" text says: "You can normal summon or set up to 3 times this turn."

1. If you already did you once per turn normal or set, then you activate "Chain summoning". Do you get 3 extra normal summons or only two?

2. If you activate "Chain Summoning" at the start of Main Phase 1. You get 3 extra normal summons in addition to your once per turn summon or set or not?