#include <stdio.h>
 
int main()
{
	int n;
  int m;
  int data[100];
  int i;
  int sum;
	scanf("%d%d", &n, &m);
  for (i=0;i < n;i++)
    scanf("%d",&data[i]);
  i = 0;
  sum = data[i];
  for (i=1;i < n;i++)
    sum += data[i];
  double hako;

  hako = 1/(4.0*m);
  

  i = 0;
  while (i < m)
  {
    if (data[i] < sum/hako)
 	{
   	   printf("No");
      return 0;
  	}
    i++;
  }
  	
      printf("Yes");
  return 0;
}