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.
2022
2005
1974
1985
2001
1976
2009
1994
2002
1999
2023
2006
2018
1939
2024
2019
2015
2011
