import sys

buf = []
while True:
    line = sys.stdin.readline().strip('\n')
    if line:
        buf.append(line)
    else:
        break
if buf:
    n = int(buf[0])
    num_down = 0
    num_up = 0
    prev_step = ''
    val = 0
    for i in range(n):
        step = buf[1][i]
        if step == "D":
            num_down += 1
            if num_down == 1 and not num_up:
                val += 1
        if step == "U":
            num_up += 1
        if num_up == num_down:
            num_up = 0
            num_down = 0
        prev_step = step
    print(val)