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.
1976
1974
2001
1985
2022
2009
2002
2005
1994
2023
2018
2019
1990
2024
1939
2011
2003
