steps = int(input().strip())
s = input().strip()

# U +1
# D -1
res = 0
stepsum = 0
beginwith = ''
for step in s:
    if step == 'U':
        stepsum +=1
        if not len(beginwith):
            beginwith = 'U'
    else:
        stepsum -=1
        if not len(beginwith):
            beginwith = 'D'
    if stepsum == 0:
        if beginwith =='D':
            res +=1
        stepsum = 0
        beginwith = ''
print(res)