In chapter 7 of "Night," how many got out of the wagon and where had they arrived?

When the Jews were taken to Gleiwitz they were given no food or water for three days.  They were then loaded onto trains and transported.  They were put into wagons and taken to Buchenwald.  Elie tells the reader on page 69,

"Meir Katz stayed in the train.  The last day had been the most murderous.  A hundred of us had got into the wagon.  A dozen of us got out - among them, my father and I."