You were looking forward to the winter holidays, you bought your plane ticket in advance, you’re waiting for snow-capped mountains and skiing. Today is the first day of rest, you have already collected a backpack, a plane ticket is complicated, it remains to leave the house and get to the airport. But suddenly you realize that you cannot find the keys to the door. It is a disaster to break down the same door. You may be late for the flight, you need to quickly think and find the key in the Winter Vacation. Connect the imagination and logic, and carefully examine all the rooms. Collect the observed numbers, they will definitely come in handy.