Sergey Razumovsky is a popular programmer in St. Petersburg. Many have heard of him, as he has his own office in one of the highest buildings At the moment, a meeting was planned, which Sergey arranged among his subscribers. You were one of his fans and walked with quick steps to the street where it was held. And so, you see a huge crowd around the stage, which stands in front of the building where his own office is located. He was already telling something on stage.What are you going to do?