#include <stdio.h>
int main(void)
{
    int i,j,n,m,tmp,sum = 0;
    double a,b;
    int number[100];
    scanf("%d %d",&n,&m);
    for(i=0;i<n;i++)
    {
        scanf("%d",&number[i]);
        sum += number[i];
    }

    for (i=0; i<n; ++i) {
    for (j=i+1; j<n; ++j) {
      if (number[i] < number[j]) {
        tmp =  number[i];
        number[i] = number[j];
        number[j] = tmp;
      }
    }
  }

  a = (double) number[m-1] / sum;
  b = (double) 1/(4*m);
  if(a>=b)
  {
      printf("Yes\n");
  }
  else
  {
      printf("No\n");
  }
    return 0;
}
