#include<stdio.h>
int main(){
  int N, M;
  scanf("%d %d",&N, &M);
  int A[N];
  int i, j, sum = 0, tmp;
  for(i=0; i < N; i++){
    scanf("%d",&A[i]);
    sum += A[i];
  }

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

  if(A[M - 1] < sum /(4 * M)) printf("No\n");

  else printf("Yes\n");

}
