#include <stdio.h>

int main(void){
  int n,m;
  double sum = 0;
  scanf("%d %d",&n,&m);
  int a[n];
  for(int i=0;i<n;i++){
    scanf("%d",&a[i]);
    sum += a[i];
  }
  for(int i=0;i<n-1;i++){
    for(int j=0;j<n-i;j++){
      if(a[j] < a[j+1]){
        int temp =a[j];
        a[j] =a[j+1];
        a[j+1] = temp;
      }
    }
  }
  if(a[m-1]<(double)sum/(4*m)){
    printf("No\n");
  }else printf("Yes\n");
  return 0;

}
