function Main(input) {
  const arr = input.split('\n');
  const m = arr[0].split(' ')[1];
  const votes = arr[1].split(' ').map(x => Number(x));
  const sum = votes.reduce((a,c) => a + c);
  const border = sum / (4 * m);

  const f = votes.filter(x => {
    return x >= border;
  });

  if (f.length >= m) {
    console.log('Yes');
  } else {
    console.log('No');
  }
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));