n = int(input().strip())
travels = input().strip()
current_level = 0
under_the_sea = False
valleys = 0
for char in travels:
    last_level = current_level
    if char == "U":
        current_level += 1
    elif char == "D":
        current_level -= 1
    if last_level < 0:
        under_the_sea = True
    else:
        under_the_sea = False
    if under_the_sea is True and current_level == 0:
        valleys += 1
print(valleys)