#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin >> N;
  string s;
  cin >> s;
  int red = count(s.begin(), s.end(), 'R');
  int blue = count(s.begin(), s.end(), 'B');
  if (red > blue)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}
