#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

int main(void) {
  int n, m;
  scanf("%d %d", &n, &m);

  int score_sum = 0, score[n];
  for (int i = 0; i < n; i++) {
    scanf(" %d", &score[i]);
    score_sum += score[i];
  }

  int count = 0;
  float thr = score_sum / (4 * m);
  for (int i = 0; i < n; i++) {
    if ((float) score[i] >= thr) {
      count++;
    }
  }

  if (count >= m) {
    printf("Yes\n");
  } else {
    printf("No\n");
  }

  return 0;
}
