x = gets.to_i
kyu = nil

case x
when 400...599
  kyu = 8
when 600...799
  kyu = 7
when 800...999
  kyu = 6
when 1000...1199
  kyu = 5
when 1200...1399
  kyu = 4
when 1400...1599
  kyu = 3
when 1600...1799
  kyu = 2
when 1800...1999
  kyu = 1
end

puts kyu