#include <bits/stdc++.h>
using namespace std;

int main(){
  int N; cin >> N;
  string s;cin >> s;
  int r=0, b=0;
  for(auto k: s){
    if (k=='B') b++;
    else r++;
  }
  if (r>b) cout << "Yes" << endl;
  else cout << "No" << endl;
}
