#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>

#define ALL(x) (x).begin(),(x).end()
#define REP(i,n) for(int i = 0;i < (n);i++)
#define PI 3.14159265359
#define MOD 1000000007

using namespace std;

int main(){
    int l,n,ans = 0;
    cin >> l >> n;
    REP(i, n){
        string s;
        cin >> s;
        int p = 1;
        REP(j,l - s.length()){
            p *= 2;
        }
        ans += p;
    }
    cout << ans << endl;
    return 0;
}