function main(input) {
    input = input.trim().split("\n");
    var m = input[0].split(" ")[1];
    var a = input[1].split(" ").map(x => Number(x));
    var sum = a.reduce((a, c) => a + c);
    var border = sum / (4*m);

    var ans = a.filter(x => {
        return x >= border;
    });

    if (ans.length >= m) {
        console.log("Yes");
    } else {
        console.log("No");
    }
}

main(require("fs").readFileSync("/dev/stdin", "utf8"));