n = int(raw_input().strip())
step = raw_input().strip()
level=0
flag=1
status='s'
count=0
for x in step:
	if x=='U':
		level+=1
	if x=='D':
		level-=1
	if status=='s' and level<0 :
		status='v'
	elif status=='s' and level>0 :
		status='m'
	elif status =='v' and level==0:
		status='s'
		count+=1
	elif status == 'm' and level==0:
		status='s'
print count