You are the owner of a large construction company that has received a contract from the city to build a certain number of buildings. Today in the new exciting online game City Builder you will build them. In front of you on the screen you will see a construction site on which the foundation of a building of a certain size will be visible. A crane will appear above the platform, which will mix one of the sections of the house. You will need to guess the moment when this section is exactly above the foundation and throw it down. Thus, you will install this section and for this you will receive points in the City Builder game. By performing these actions, your task is to build buildings with a certain number of floors.