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

n = int(raw_input().strip())
hike = list(raw_input().strip())

lvl = 0
v = 0
for step in hike:
    if step == 'U':
        if lvl == -1:
            v += 1
        lvl += 1
    else:
        lvl -= 1
print v