steps = input()
updown = list(raw_input())
height = [0]
valleys = 0
in_valley = False
for x in updown:
	if x == "U":
		height.append(height[-1] + 1)
	if x == "D":
		height.append(height[-1] - 1)
for h in range(0,steps+1):
	if in_valley == False and int(height[h]) < 0:
		in_valley = True
	if in_valley == True and int(height[h]) == 0:
		valleys +=1
		in_valley = False
print valleys