'use strict';
function main(input) {
  const a = input.trim().split('\n')[0].split(' ').map(x => Number(x));
  const b = input.trim().split('\n')[1].split(' ').map(x => Number(x)).sort(function (a, b) {
    return b - a;
  });
  let sum = b.reduce((a,c) => a + c);

  if (b[(a[1] - 1)] < sum / 4 / a[1]) {
    console.log('No');
  } else {
    console.log('Yes');
  }
  
}

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