Tempt With Glory + Hardened Scales

I'm in a four player game and I cast Tempt With Glory. Each opponent decides to add counters to their creatures. Do I add 3 counters one time, or 1 counter three times?

Edited Dan Fox (Nov. 18, 2014 09:48:20 PM)

Tempt with Glory is trying to add three counters to your creatures once, not one counter three times. If all your opponents decide to add counters to their creatures, your creatures will each end up with a total of six counters on them–two from the initial counter placement, before your opponents' decisions, and four from the second placement after they decide.