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

import sys

n = int(raw_input().strip())
walk = list(raw_input())


level = 0
prev_level = 0
valley_counter = 0
valley_flag = False

for i,v in enumerate(walk):
	if v == "U":
		prev_level = level
		level +=1
		#print "Step up"
	if v == "D":
		prev_level = level
		level -=1
		#print "Step down"
	#print level
	if level == -1 and  prev_level == 0:		
		valley_counter += 1
		#print "Valley detected"
print valley_counter