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

num = gets
step_lst = gets.strip().scan /\w/

val_count = 0
posY = 0
posY_arr = [0];
step_lst.each do |s|
    if s == 'U'
        posY += 1
    else
        posY -= 1
    end
    posY_arr.push(posY)
end

i = 1
while i <= posY_arr.length-1 do
    c_point = posY_arr[i]
    if c_point == 0 && posY_arr[i-1] < 0
        val_count += 1
    end
    i += 1        
end

puts val_count