import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import static java.lang.System.in;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        int L = Integer.parseInt(reader.readLine());
        int N = Integer.parseInt(reader.readLine());
        String[] inputs = reader.readLine().split(" ");
        int sum = 0;
        for (int i = 0; i < N; i++) {
            String pattern = inputs[i];
             int diff = L-pattern.length();
             int m =(int) Math.pow(2,diff);
             sum+=m;
        }
        System.out.println(sum);
    }

}