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