# Enter your code here. Read input from STDIN. Print output to STDOUT

class Trail
    attr_accessor :valleys, :mountains

    def initialize
        @path = :sea_level
        @level = 0
        @valleys = 0
        @mountains = 0
        @steps_taken = 0
    end
    
    def hike
        @path = :upwards
    end
    
    def descend
        @path = :downwards
    end
    
    def walk(steps)
        steps.each do |step|
            case step
            when 'D'
                @level -= 1
                @mountains += 1 if @level == 0
            when 'U'
                @level += 1
                @valleys += 1 if @level == 0
            end
            @steps_taken += 1
        end
    end
end

n_steps = gets.strip.to_i
steps = gets.strip.split('')
trip = Trail.new
trip.walk(steps)
puts trip.valleys