n = int(input().strip())
l = list(input().strip())[:n]
counter = level = 0
inv = 0
for char in l:
    if char == 'U':
        level += 1
    if char == 'D':
        level -= 1
    if char == 'D' and level == -1 and inv == 0:
        inv = 1
    if char == 'U' and inv == 1:
        inv = 0
        counter += 1
print(counter)