#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
#include<cstdio>
using namespace std;
int main(){
    long long L,N,ans=0,num;
    string str;
    cin >> L >> N;
    while(N--){
        cin >> str;
        num = 1;
        for(long long i=1;i<=L-str.size();i++){
            num*=2;
        }
        ans+=num;
    }
    cout << ans;
    return 0;
}