num = int(raw_input())
stri = raw_input()
i = 0
temp = 0
v = False
numV = 0

while (i < num):
  temp = 0
  if stri[i] == "U":
    temp = temp + 1
  else:
    temp = temp - 1
  i = i + 1
  
  if i < num:
    while temp != 0:
  
      if stri[i] == "U":
        temp = temp + 1
        v = True
      else:
        temp = temp - 1
        v = False
      i = i + 1 
  
    if v == True:
      numV = numV + 1
  
print numV