let arr=readLine()!.characters.split{$0==" "}.map{Int(String($0))!}
var a=arr[0]
var b=arr[1]
let arr2=readLine()!.characters.split{$0==" "}.map{Int(String($0))!}
var x = 0
var y = 0
for(int i = 0 ;i<b;i++)
{
  x += arr2[i]
  if(i == b-1){
    y = arr2[i]
  }
}

var z = x / (4*b)
if(z<y){
  print("Yes")
}else{
        print("No")

}
