#include <stdio.h>

int main(void) {  
  int N=0, M=0;
  int vote[100];
  scanf("%d%d",&N,&M);
  int count = 0;
  int sum = 0;
  for (int i = 0; i < N; ++i) { 
    scanf("%d",&vote[i]);
    sum += vote[i];
  }
  
  for (int i = 0; i < N; ++i){
    if (vote[i] >= (double)sum/(4*M)) count++;
  }
  
  if (count >= M) printf("Yes");
  else printf("No");
  
  return 0;
}