function Main(input) {
	input = input.split("\n");
	tmp = input[0].split(" ");
	var nums = Number(tmp[0])
    var picks = Number(tmp[1])
    var required = 1/(4*picks)
    var ans = 'Yes'
	var list = input[1].split(' ')
    list.sort((a,b) => Number(b) - Number(a))
  	var sum = list.reduce((a, b) => Number(a) + Number(b))
    if(list[picks-1]/sum < required) return console.log('No')
  	console.log('Yes')
}

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