#include <algorithm>
#include <array>
#include <cmath>
#include <cstdio>
#include <iostream>
#include <numeric>
#include <optional>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using namespace std;

int main() {
    int32_t l, n;
    cin >> l >> n;
    int64_t ans = 0;
    for (auto i = 0; i < n; ++i) {
        string s;
        cin >> s;
        ans += 1 << (l - 3);
    }
    cout << ans << endl;
    return 0;
}