#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;

int main(){
   int n,k; cin >> n >> k;
   int a=0;
   for(int i=0; i < n;i++){
    int j; cin >> j;
    if(j >= 30) a++;
   }
   if(a >= k) cout << "Yes" << endl;
   else cout << "No" << endl;
}