#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < n; i++)

int main()
{
  int L, N;
  string S[30];
  cin >> L;
  cin >> N;
  rep(i, N) cin >> S[i];
  cout << (long long)pow(2, L - 3) * N << endl;
}