function main(input) {
  const inputs = input.split('\n')
  const [N, M] = inputs[0].split(' ').map(Number)
  const A = inputs[1].split(' ').map(Number)
  const all = A.reduce((h, e) => { return h + e }, 0)
  const ratio = 1 / (4 * M) * all
  const a = A.filter(e => {
    return ratio <= e
  })
  console.log(a.length >= M ? 'Yes' : 'No')
}
main(require("fs").readFileSync("/dev/stdin", "utf8"));

