#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  string s;
  cin >> s;
  int red = 0;
  int blue = 0;
  for (int i = 0; i < n; i++) {
    if (s[i] == 'R') red++;
    if (s[i] == 'B') blue++;
  }
  cout << (red > blue) ? "Yes" : "No";
}
