#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n, m;   cin >> n >> m;

    int Sum = 0;

    vector <int> A(n);
    for(int& x : A) scanf("%d", &x), Sum += x;
    sort(A.begin(), A.end(), greater <int> ());

    puts(4 * m * A[m - 1] >= Sum ? "Yes" : "No");
}
