    input_lines = input()
    n = int(input_lines)
    input_lines = input()
    r_i = 0
    b_i = 0
    for c in s:
        if c == 'R':
            r_i += 1
        if c == 'B':
            b_i += 1
        
    if r_i > b_i:
        print('Yes')
    else:
        print('No')