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// Krzysztof Małysa
#include <bits/stdc++.h>
using namespace std;

#define FOR(i,a,n) for (int i = (a), i##__ = (n); i <= i##__; ++i)
#define REP(i,n) FOR(i,0,n-1)
#define FORD(i,a,n) for (int i = (a), i##__ = (n); i >= i##__; --i)
#define ALL(x) x.begin(), x.end()
#define EB emplace_back
#define ST first
#define ND second
#define OO(A) template<class... T> ostream& operator<<(ostream& os, const A<T...>& x) { return __o(os, ALL(x)); }
#define SZ(x) ((int)x.size())

typedef long long LL;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<PII> VPII;

template<class A, class B> ostream& operator<<(ostream&, const pair<A, B>&);
template<class I> ostream& __o(ostream&, I, I);
template<class T, size_t N> ostream& operator<<(ostream& os, const array<T, N>& x) { return __o(os, ALL(x)); }
OO(vector) OO(deque) OO(set) OO(multiset) OO(map) OO(multimap)
template<class A, class B> ostream& operator<<(ostream& os, const pair<A, B>& p) {
	return os << "(" << p.ST << ", " << p.ND << ")";
}
template<class I> ostream& __o(ostream& os, I a, I b) {
	os << "{";
	for (; a != b;)
		os << *a++, cerr << (a == b ? "" : " ");
	return os << "}";
}
template<class I> ostream& __d(ostream& os, I a, I b) {
	os << "{\n";
	for (I c = a; a != b; ++a)
		os << "  " << distance(c, a) << ": " << *a << endl;
	return os << "}";
}
template<class... T> void __e(T&&... a) {
	int t[] = {(cerr << forward<T>(a), 0)...}; (void)t;
	cerr << endl;
}

template<class A, class B> void mini(A& a, B&& b) { if (b < a) a = b; }
template<class A, class B> void maxi(A& a, B&& b) { if (b > a) a = b; }
int ceil2(int x) { return 1 << (sizeof(x) * 8 - __builtin_clz(x - 1)); }

#ifdef DEBUG
# define D(...) __VA_ARGS__
#else
# define D(...)
#endif

#define LOG(x) D(cerr << #x ": " << x)
#define LOGN(x) D(LOG(x) << endl)
#define DUMP(x) D(cerr << #x ": ", __d(cerr, ALL(x)) << endl)
#define E(...) D(__e(__VA_ARGS__))
#define endl '\n'
constexpr char nl = '\n';
// End of templates

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin >> n;
	vector<unsigned long long> klauzule;
	string in;
	cin.ignore();
	getline(cin, in);
	vector<string> xx;
	{
		string tmp;
		in += '^';
		for (char c : in) {
			if (isdigit(c))
				tmp += c;
			else if (c == '~')
				tmp += '-';
			else if (c == 'v')
				tmp += ' ';
			else if (c == '^') {
				xx.EB(move(tmp));
				tmp = "";
			}
		}
	}
	DUMP(xx);

	for (auto&& s : xx) {
		s += ' ';
		unsigned long long mask = 0;
		string a;
		for (char c : s) {
			if (c != ' ')
				a += c;
			else {
				int x = atoi(a.c_str());
				a.clear();
				LOGN(x);
				assert(-n <= x && x <= n && x != 0);
				if (x < 0)
					mask |= 1ull << (-1 - x);
				else
					mask |= 1ull << (n + x - 1);
			}
		}
		assert(a.empty());
		klauzule.EB(mask);
	}

	LOGN(klauzule);

	LL res = 0;
	for (unsigned long long mask = 0, end = (1ull << n); mask < end; ++mask) {
		unsigned long long full_mask = (mask | ((~mask) << n));
		for (auto&& k : klauzule)
			if ((full_mask & k) == 0)
				goto no;
		++res;
		LOGN(mask);
		LOGN((full_mask & ((1 << (n << 1)) - 1)));
	no:;
	}
	cout << res % 1000000007 << endl;
	return 0;
}

/*
3 1
0 5 4
1 2 1
0 30 25
TAK

4 3
0 4 3
0 4 3
0 4 3
0 4 3
TAK
*/