Array.prototype.aggregate = function(){
  	return this.reduce((a,b)=>(a[b]=(a[b]||0)+1)&&a,{});
 }

function Main(input){
	input = input.split("\n");
  var h = input[1].split("").aggregate();
  return h['R']>h['B']?"Yes":"No";
}

// If you are interested in the algorithms I used, 
// there is no need to read down from this line.

((b,c,d)=>"undefined"!=typeof require?console.log(Main(require("fs").readFileSync("/dev/stdin","utf8"))):[b=b.split("\n").slice(1,-1).join("\n"),c=function(){try{return Main(b)}catch(f){return f.stack||f.message}}(),d=typeof c,"string"==d||(c=JSON.stringify(c)),$("<form>").append([[10,b],0,[1,d],0,[10,c]].map(f=>$(f?"<textarea>":"<br>",f&&{rows:f[0],cols:40,text:f[1]}))).appendTo("body")])(`
4
RBBR
`);