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#include <bits/stdc++.h>

using namespace std;
typedef long long int64;
#define DEBUG(x) cerr << #x << " = " << x << endl;
#define REP(x, n) for(__typeof(n) x = 0; x < (n); ++x)
#define FOR(x, b, e) for(__typeof(b) x = (b); x != (e); x += 1 - 2 * ((b) > (e)))
const int INF = 1000000001;
const double EPS = 10e-9;

vector<vector<pair<int, bool>>> parse(string& input) {
    vector<vector<pair<int, bool>>> result;
    int i = 0;
    while (i < input.size()) {
        if (input[i] == ' ' || input[i] == '(' || input[i] == '^') {
            ++i;
            continue;
        }
        vector<pair<int, bool>> list;
        while (input[i] != ')') {
            if (input[i] != '~' && input[i] != 'x') {
                ++i;
                continue;
            }
            pair<int, bool> item;
            if (input[i] == 'x') {
                item.second = true;
                ++i;
            } else {
                item.second = false;
                i += 2;
            }
            item.first = 0;
            while (input[i] != ' ' && input[i] != ')') {
                item.first *= 10;
                item.first += input[i++] - '0';
            }
            list.push_back(item);
        }
        result.push_back(list);
        ++i;
    }
    return result;
}

bool test(int value, vector<vector<pair<int, bool>>>& statement) {
    for (auto list : statement) {
        bool t = false;
        for (auto it : list) {
            int mask = 1 << (it.first - 1);
            if (((value & mask) != 0) == it.second) {
                t = true;
                break;
            }
        }
        if (!t) {
            return false;
        }
    }
    return true;
}

#ifndef CATCH_TEST
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);

    int n;
    cin >> n;
    string input;
    getline(cin, input);
    getline(cin, input);

    auto statement = parse(input);

    int l = 1 << n;
    int result = 0;

    REP(x, l) {
        if (test(x, statement)) {
            result++;
        }
    }
    cout << result << endl;

	return 0;
}
#endif