steps  = gets.chomp.to_i
step   = gets.chomp
count  = 0
valley = 0

(1..step.length).each do |n|
  if step[n-1] == "U"
    count += 1
    valley += 1 if count == 0
  elsif step[n-1] == "D"
    count -= 1
  else
    count += 0
  end
end

puts valley