count = int(input())
steps = list(input())
start = 0
valleys = 0
mountain = True
for i in range(count):
    if steps[i] == "U":
        start += 1
    if steps[i] == "D":
        start -= 1
    if start < 0:
        mountain = False
    if mountain == False and start >= 0:
        mountain = True
        valleys += 1
print(valleys)