#include <bits/stdc++.h>
using namespace std;
int main() {
  int a;
  cin >> a;
  string s;
  getline(cin, s);
  int r_total = 0, b_total = 0;
  for (int i = 0; i <= s.size() - 1; i++) {
    if (s[i] == 'B')
      b_total++;
    else if (s[i] == 'R')
      r_total++;
  }
  if (b_total > r_total)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}
