#include <stdio.h>
int main() {
  int n, m, sum = 0;
  scanf("%d %d", &n, &m);
  int a[n];
  for (int i = 0; i < n; i++) {
    scanf("%d", &a[i]);
    sum = sum + a[i];
  }
  double line = sum / (4 * m);
  int count = 0;
  for (int i = 0; i < n; i++) {
    if (a[i] >= line) {
      count = count + 1;
    }
  }
  if (count >= m) {
    printf("Yes");
  } else {
    printf("No");
  }
  return 0;
}