#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, r = 0, b = 0;
  cin >> n;
  char s[4];
  for (int i = 0; i < n; i++) {
    cin >> s[i];
  }
  for (int i = 0; i < n; i++) {
    if (s[i] == 'B')
      b += 1;
    else
      r += 1;
  }
  if (r > b)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
