#include<stdio.h>
int main()
{int i,n,m,c=0;
 scanf("%d%d",&n,&m);
 int *arr,sum=0;
 arr=(int*)malloc(n*sizeof(int));
 for(i=0;i<n;i++)
 {scanf("%d",(arr+i));
  sum+=*(arr+i);}
 for(i=0;i<n;i++)
 {if(*(arr+i)>=(sum/(4*m)));
   c++;
 }
 if(c>=m)
   printf("Yes");
 else
   printf("No");
}
