import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int x = sc.nextInt();
        long m = sc.nextInt();
        int[] counts = new int[n];
        for (int i = 0; i < n; i++) {
            int y = sc.nextInt();
            while (y >= x) {
                y /= 2;
                counts[i]++;
            }
        }
        int score = 0;
        for (int i = n - 1; i >= 0; i--) {
            if (counts[i] - score > 0) {
                m -= (i + 1L) * (counts[i] - score);
                score = counts[i];
            }
        }
        if (m >= 0) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
}
    
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}