#include <stdio.h>
int main(void){
  int n,m;
  int i,j;
  int acc=0;
  int sum=0;
  double pum;
  int num[99];
  scanf("%d", &n);
  scanf("%d", &m);
  for (i=0; i<n; i++){
    scanf("%d", &num[i]);
    sum=sum+num[i];
  }
  pum=(double)sum/(m*4);
  for (j=0;j<n;j++){
    if(num[j]>=pum){
      acc++;
    }
  }
  if (acc<m){
    printf("No");
  }
  else
    printf("Yes");
  return 0;
}