/* -*- coding: utf-8 -*-
 *
 * 3702.cc:  No.3702 襍､轤ｹ縺ｫ縺ｪ繧翫◆縺上↑縺・ｼ・(Don't Wanna Fail!) - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 100;

/* typedef */

/* global variables */

int as[MAX_N];

/* subroutines */

/* main */

int main() {
  int n, k;
  scanf("%d%d", &n, &k);
  for (int i = 0; i < n; i++) scanf("%d", as + i);
  sort(as, as + n);

  if (as[n - k] >= 30) puts("Yes");
  else puts("No");
  
  return 0;
}