# Enter your code here. Read input from STDIN. Print output to STDOUT
steps = gets.chomp.to_i
hike = gets.chomp
array = hike.split("")
level = 0
hill = 0
hills = 0
valley = 0
valleys = 0
steps.times do |n|
  if array[n] == "U"
    level += 1
    if level > 1
      hill += 1
    elsif level == 0 && valley > 0
      valleys += 1
    end
  elsif array[n] == "D"
    level -= 1
    if level < 1
      valley += 1
    elsif level == 0 && hill > 0
      hills += 1
    end
  end
end
  
# puts "Hills: #{hills}, valleys#{valleys}"
puts hills + valleys