#inculde <stdio.h>
 int main (void){
   int n,m;
   int a[1000];
   int count=0;
   int sum=0;
   int i;
   
   scanf("%d %d",&n,&m);
   for(i=0;i<n;i++){
     scanf("%d ",&a[i]);
     sum=sum+a[i];
   }
   for(i=0;i<n;i++){
     if(a[i]>=sum/4*m)
       count++;
   }
   
   if(count>=m)
     puts("Yes");
   else 
     puts("No");