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

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

sea_level = 0
valley = False
total_valleys = 0
for x in hills_n_valleys:
    if x == 'U':
        sea_level += 1
        if valley and sea_level == 0:
            total_valleys += 1
    elif x == 'D':
        sea_level -= 1
    if sea_level < 0:
        valley = True
print total_valleys