import sys

n = n = int(input().strip())
walk = list(str(input()))

current = 0
num_valleys = 0

is_valley = False

for step in walk:
	# if we're going up
	if step == 'U':
		if is_valley:
			# if we are just coming out of a valley mark that we have another valley
			if current == -1:
				num_valleys += 1
				is_valley = False

		current += 1
	# if we're going down and we were at sea level, mark that we're now in a valley
	elif step == 'D':
		if current == 0:
			is_valley = True

		current -= 1

print(num_valleys)