import sys
from pprint import pprint

def solve(N, people):
    n_red = 0
    n_blue = 0
    for i in xrange(len(people)):
        #print i, people[i]
        if people[i] == "R":
            n_red += 1
        elif people[i] == "B":
            n_blue += 1
        else:
            print "something wrong!"

    if n_red > n_blue:
        return "Yes"
    else:
        return "No"

if __name__ == '__main__':

    N = sys.stdin.readline().strip()
    people = sys.stdin.readline().strip()
    ans = solve(int(N), people)
    print ans