function Main(input) {
	tmp = input.split("\n");
	tmp_in = tmp[0].split(" ");
	var n = parseInt(tmp_in[0]);
	var m = parseInt(tmp_in[1]);
	var r = 0;
	data = tmp[1].split(" ");
	var max = 0;
	for(var i = 0;i < data.length;i++){
		max += parseInt(data[i]);
	}
	var min = max/(4*m);
	for(var i = 0;i < data.length;i++){
		if(data[i] >= min){
			r++;
		}
	}
	if(r >= m){
		console.log("Yes");
	}else{
		console.log("No");
	}
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));