num_steps = int(input().strip())
log = input().strip()

steps = list()

for step in range(0,num_steps):
    steps.append(log[step])

elevation = 0
prev_elevation = None

valleys = 0

for step in steps:
    if step == "U":
        prev_elevation = elevation
        elevation += 1
    else:
        prev_elevation = elevation
        elevation -= 1

    #if prev_elevation >= 0 and elevation < 0:
    #   valleys += 1
    if prev_elevation < 0 and elevation == 0:
        valleys += 1

print(valleys)