#include <bits/stdc++.h>
using namespace std;
int main(){
  int N, M, L;
  cin >> N >> M >> L;
  M--;
  L--;
  vector<int> A(N);
  for (int i = 0; i < N; i++){
    cin >> A[i];
    A[i]--;
  }
  vector<vector<bool>> dp(N + 1, vector<bool>(1000, false));
  dp[0][L] = true;
  for (int i = 0; i < N; i++){
    for (int j = 0; j < 1000; j++){
      if (dp[i][j]){
        dp[i + 1][j] = true;
        dp[i + 1][(j + A[i]) / 2] = true;
      }
    }
  }
  if (dp[N][M]){
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}