import Foundation

let numArray = (readLine()!).componentsSeparatedByString(" ").map{ Int($0) ?? 0 }
let Ai = (readLine()!).componentsSeparatedByString(" ").map{ Int($0) ?? 0 }
var count  = 0

let sumAi = Ai.reduce(0) {(num1: Int, num2: Int) -> Int in
    return num1 + num2
}

for i in 0...numArray[0]-1{
    if Ai[i] > sumAi/(4*numArray[1]) {
        count+=1
    }
}
print(count > numArray[1] ? "Yes" : "No")
