import Foundation

let input = readLine()!.componentsSeparatedByString(" ").map{ Double($0)! }
let array = readLine()!.componentsSeparatedByString(" ").map{ Double($0)! }

let vote = array.reduce(0){ $0 + $1 }

var count: Double = 0
for i in array {
  if ( i >= ( vote + 1.0) / ( 4.0 * input[1] ) ){
    count += 1
  }
}
if ( count >= input[1] ){
  print("Yes")
}else{
  print("No")
}