How many days after the American and Soviet forces met at the Elbe river was the Reichstag captured?
return the  American and  Soviet forces met at the   Elbe river ;return Reichstag captured ;return when  was  #1 ;return when  was  #2 ;return difference of #4 and  #3 in  days
['select', 'select', 'project', 'project', 'arithmetic']