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