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.
2005
1963
1976
1994
2024
2017
2001
2009
2002
1985
2019
1974
2011
2006
1999
2015
1981
2018
2022
