#include <stdio.h>
#include <math.h>
 
int main(void)
{
  int n, m, a[1000];
  int i, j, sum = 0, result = 0;
  
  scanf("%d %d", &n, &m);
  
  for( i = 0; i < n; i++ ){
    scanf("%d", &a[i]);
    sum += a[i];
  }
  
  for( i = 0; i < n; i++ ){
    if( a[i] * 4 * m >= sum ){
      result++;
    }
  }
  
  if( result >= m ){
    printf("Yes\n");
  } else {
    printf("No\n");
  }

  return 0;
}