# Enter your code here. Read input from STDIN. Print output to STDOUT
step_count = gets.chomp.to_i
steps = gets.chomp.split("")
height = 0
valley_count = 0
steps.each do |step|
    if step == "U"
        height+=1
    else
        height-=1
    end
    if height==0 and step == "U"
        valley_count+=1
    end
end
puts valley_count