output_description: Print `Yes` if you will turn on the air conditioner; print `No` otherwise.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      X
attempt: N = int(input())
  c = list(input())
  if c.count("R") == N:
      print(0)
      exit()
  div = 0
  addcnt = 0
  if N % 2 == 1:
      div = 1
      Q = c[int(N / 2)]
      # print(Q)
      if Q == "W":
          addcnt += 1
          # print('QQQ!')
  clist_L = c[: int(N / 2)]
  clist_R = c[int(N / 2) + div :]
  Lcnt = clist_L.count("W")
  Rcnt = clist_R.count("R")
  if Lcnt - Rcnt <= 0:
      print(Rcnt - addcnt)
  else:
      print(Lcnt - Rcnt + addcnt)
  
problem_description: Statement
  
  You will turn on the air conditioner if, and only if, the temperature of the
  room is 30 degrees Celsius or above.
  
  The current temperature of the room is X degrees Celsius. Will you turn on the
  air conditioner?
samples: [{"input": "25", "output": "No\n    \n\n* * *"}, {"input": "30", "output": "Yes"}]