# Enter your code here. Read input from STDIN. Print output to 
p = input()
st = raw_input()
l = list(st)
vc = 0
cnt = 0
flag = 0
for i in l:
    if i == 'U':
        cnt +=1
    if i == 'D':
        cnt -= 1
    if cnt < 0:
        flag = 1
    if flag ==  1 and cnt == 0:
        vc +=1
        flag = 0
print vc