Albert@s
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Okay, so we have:
Accommodation from May 6th to 8th (breakfast included) - 15000
Banquet: 2500 * 2 = 5000
Payment for the conference center - 3100/3500 (per person)
Total: 23100/23500
The room has been booked and confirmed by the Dubrovsky Park Hotel.
PS It turned out to be just like in the classics: "Give me three thousand...!!!"