#include <bits/stdc++.h>

using namespace std;

int main() {
  int n, m;
  scanf("%d %d", &n, &m);
  vector<int> a(n);
  int sum = 0;
  for(int &x : a) scanf("%d", &x), sum += x;
  
  int ans = 0;
  for(int x : a) {
    if(x * 4 * m >= sum)
      ans++;
  }

  printf("%s\n", ans >= m ? "Yes" : "No");
}