import java.util.Scanner;

class paiza {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        int length = sc.nextInt();
        int num = sc.nextInt();
        String codon[] = new String[num];
        
        for (int i = 0; i < num; i++) {
        	codon[i] = sc.next();
        }
        System.out.println( (int)Math.pow(2, (length - codon[0].length())) * num );
    }
}