function Main(input) {
    const inputArr = input.split("\n")
    const nm = inputArr[0].split(" ")
    const as = inputArr[1].split(" ").map(e=>Number(e))
    const sum_a = as.reduce((pre, cur)=>pre+=cur)
    let i = 0;
    let count = 0;
    while (i < as.length) {
        if (as[i] >= sum_a * (1 / (4 * nm[1]))) {count ++}
        i++
    }
    console.log(count >= nm[1] ? 'Yes' : 'No')
}
// Main(`12 3
// 4 56 78 901 2 345 67 890 123 45 6 789`)
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
