# Enter your code here. Read input from STDIN. Print output to STDOUT
le=int(raw_input())
stepstr = raw_input()
sea = 0
val = 0
maybev = False
for let in stepstr:
    if let == 'U':
        sea += 1
    if let == 'D':
        sea -= 1
    if sea == 0 and maybev:
        val+=1
        maybev = False
    if sea < 0 and not maybev:
        maybev = True
print val