#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin >> N;
  string s;
  cin >> s;
  int r, b;
  for (auto k : s) {
    if (k == 'B')
      b++;
    else
      r++;
  }
  if (r > b)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
