# Enter your code here. Read input from STDIN. Print output to STDOUT

num = int(raw_input())
arr = raw_input().strip()

steps = [(lambda x: 1 if x == 'U' else -1)(el) for el in arr]
res = []
sum = 0
for elem in steps:
    sum += elem
    res.append(sum)

valley = 0
for ix, el in enumerate(res):
    if ix > 0 and el == 0 and res[ix - 1] < 0:
        valley += 1

print valley