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

n = int(raw_input())
arr = raw_input().strip()
level = 0
mount = 0
valley = 0
for i in arr:
    if i == 'U':
        level += 1
        if level == 0: valley += 1
    elif i == 'D':
        level -= 1
        if level == 0: mount += 1
print valley