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

n = gets.strip.to_i
steps = gets.strip

oldLevel = 0
count = 0

for i in 0..(n-1)
	if steps[i] === "U"
		newLevel = oldLevel + 1
	elsif steps[i] === "D"
		newLevel = oldLevel - 1
	end

	if oldLevel === -1 && newLevel === 0
		count += 1
	end
	oldLevel = newLevel
end

puts count