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

n = raw_input()
s = raw_input()

sealvl = 0
valley = 0
previous = 0
for x in range(len(s)):
    if(sealvl == -1 and previous == 0):
        valley = valley + 1
    if(x != 0):
        previous = sealvl
    if(s[x] == "U"):
        sealvl = sealvl + 1
    else:
        sealvl = sealvl - 1
print(valley)