# Enter your code here. Read input from STDIN. Print output to STDOUT
num = input()
hike = map(lambda x: 1 if x=='U' else -1, list(raw_input()))

loc = 0
valley = 0

for i in xrange(num):
    loc = loc + hike[i]
    if loc == 0 and hike[i]>0 :
            valley = valley + 1

print valley