// Popular Vote

func main() {
    let m = readLine()!.split(separator: " ").map{Int($0)!}[1]
    let a = readLine()!.split(separator: " ").map{Int($0)!}.sorted(by: >)
    
    let sum = a.reduce(0, +)

    if a[m-1] * 4 * m < sum {
        print("No")
    } else {
        print("Yes")
    }
}

main()