#include <bits/stdc++.h>
using namespace std;
int main() {
  int N, r, b;
  cin >> N;
  char s[N];
  cin >> s;
  for (int i = 0; i < N; i++) {
    if (s[i] == 'R')
      r++;
    else if (s[i] == 'B')
      b++;
  }
  if (r > b)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}
