#include <stdio.h>
#include <stdlib.h>

int main(void)
{
  float able=0,SumA=0, M=0;
  int N=0;
  scanf("%d%f",&N,&M);
  int A[N];
  for (int i=0;i<N;i++){
    scanf("%d",&A[i]);
    SumA += A[i];
  }
  for (int i=0;i<N;i++){
    if (A[i]>=SumA*(1/(4*M)))
    able++;
  }
  if (able>=M)
    printf("Yes");
  else
    printf("No");
  return 0;
}