module b;

import std.conv, std.stdio;
import std.algorithm, std.array, std.string, std.range;

void main()
{
    auto buf = readln.chomp.split.to!(int[]);
    auto votes = readln.chomp.split.to!(int[]);
    auto s = votes.sum;
    auto popular = votes.count!(a => s <= a * 4 * buf[1]);
    ((buf[1] <= popular) ? "Yes" : "No").writeln;
}
