def red_or_blue(N, s):
  s_1 = [x for x in s]
  l_r = s_1.count('R')
  l_b = s_1.count('B')
  if l_r > l_b:
    return 'Yes'
  else:
    return 'No'

i = input().split() 

N = i[0]
s = i[1]
print(red_or_blue(N, s))