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

n = int(raw_input().strip())
steps = raw_input()

valley = 0
current = 0
for i in range(len(steps)):
    if steps[i] == 'U':
        current += 1
    if steps[i] == 'D':
        current -= 1
    if current == 0:
        if steps[i] == 'U':
            valley += 1

print valley