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.
1977
1962
2010
1942
1946
2015
2014
2019
1954
1970
1959
2008
1955
2003
2011
2021
1944
2012
1940
