# Enter your code here. Read input from STDIN. Print output to STDOUT
len = gets.strip.to_i
arr = gets.strip.split('')
valleys = 0
level = 0
down = false
arr.each do |l|
    if l == 'U'
        level += 1
    else
        level -= 1
    end
    if level < 0
        down = true
    end
    if level == 0 and down
        valleys += 1
        down = false
    end
end
puts valleys