The doors of the jam produced by a company do not open. In order for them to be able to sell their jam, they reward the one who can open the jam. All the people try to open the door of the jam.
1994
1974
2009
2017
1976
2005
2002
2022
1985
2001
2023
2024
2018
1990
2011
2019
1939
