Doing the sums 1

Overheard:

"Why is there only one member of staff on the counter upstairs?"

"Two people are off sick and three are on leave."

"Why on earth have you let three people take leave?"

"They're taking the leave you didn't let them have last year because we were short-staffed and you've told them that they can't roll over any unused leave into the next financial year."

"Why are we short staffed?"

"Because we've got eight vacancies that you haven't let us fill and we're covering the vacancies at Grimley and Umpty."

"You really need to sort that rota out."