#include <vector>
#include <string>
#include <algorithm>
#include <numeric>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <utility>
#include <list>
#include <functional>
#include <queue>
#include <map>
#include <iterator>
#include <iomanip>
#include <complex>
#include <cctype>
using namespace std;

using ull = unsigned long long;
using ll = long long;


int main()
{
  int l,n;
  cin >> l >> n;

  vector<string> data(n);

  for(auto&& x : data)  cin >> x;
  
  ull result = 0;
  for(auto&& x : data)
  {
    int sub = l - x.size();
    result += 1 << sub;
  }

  cout << result << endl;
}