# Enter your code here. Read input from STDIN. Print output to STDOUT
n = gets.to_i
steps = gets
sea_level = 0
valley = 0
steps.each_char do |c|
	if(c == 'U')
		sea_level = sea_level + 1
		if sea_level == 0
			valley = valley + 1
		end
	elsif(c == 'D')
		sea_level = sea_level - 1
	end
end

puts valley