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//parse test

#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <set>
#include <vector>

using namespace std;

#define REP(i, n) for (int i = 0; i < (int)n; i++)
#define ST first
#define ND second
#define MP make_pair
#define PB push_back

typedef vector<int> VI;
typedef pair<int, int> PI;
typedef vector<PI> VPII;
typedef set<int> SI;
typedef long long LL;

#ifdef DEBUG
const bool debug = true;
#else
const bool debug = false;
#endif
int n, m, k, l, test = 1;
const int INF = 1000 * 1000 * 1000;
const int MAKSN = 1000 * 1000 + 13;  // UZUPElnic
const LL MOD = INF + 7;

//  nr, czy negacja
vector<vector<pair<int, bool> > > v;

void parseLine();
void parseBracket();

void readIn() {
    l = scanf("%d", &n);
    parseLine();
}

void parseLine() {
    char c;
    l = scanf("%c",&c); // '\n'
    while (true) {
        l = scanf("%c", &c);
        if (c == '\n')
            return;
        if (c == '(')
            parseBracket();
    }
}

int parseX() {
	int temp;
	l = scanf("%d", &temp);
	return temp;
}

void parseBracket() {
    vector<pair<int, bool> > temp;
    char c ='0';
    int num;
    bool krulBul;
    // printf("Tag\n"/);
    // printf("(");
    while(true) {
    	l = scanf("%c", &c);
    	// printf("%c",c);
    	krulBul = false;
    	if(c == '~') {
    		krulBul = true;
    		l = scanf("%c", &c); //x
    		// printf("%c",c);
    	}
    	if(c == 'x') {
    		num = parseX();
    		// printf("%d ", num);
    		temp.PB(MP(num, krulBul));
    	}
    	if(c == ')') 
    		break;
    	// printf( "\n");
    }
    // printf("temp %d \n", (int)temp.size());

    v.PB(temp);
}

void printOut() {
	REP(i, v.size()) {
		printf("(");
		REP(j, v[i].size()) {
			int num;
			bool b;
			num = v[i][j].ST;
			b = v[i][j].ND;
			printf("%d %d v ",num, b);
		}
		printf(")\n");
	}

}

vector<bool> curWart;
LL ans = 0;

bool spelniaLit(int pos, bool neg) {
	if(neg && !curWart[pos])
		return true;
	if(!neg && curWart[pos])
		return true;

	return false;
}

bool spelniaNaw(int nr) {
	REP(i, v[nr].size()) {
		if(spelniaLit(v[nr][i].ST-1, v[nr][i].ND))
			return true;
	}
	return false;
}

bool spelnia() {
	REP(i, v.size()){
		if(!spelniaNaw(i)) 
			return false;
	}

	return true;
}

void rec(int pos) {
	REP(i, 2) {
		// cout << pos << " ";
		curWart[pos] = i;
		if(pos == (int)curWart.size() - 1) {
			if(spelnia()) 
				ans = (ans+1) % MOD;
		}
		else rec(pos+1);
	}
}

void solve() {
	// printOut();
	curWart = vector<bool>(n, false);

	rec(0);
	printf("%lld\n", ans);
}

void zeruj() {
	v.clear();
	curWart.clear();
}

int main() {
    // ios_base::sync_with_stdio(0);

    // cin >> test;
    REP(i, test) {
        zeruj();
        readIn();
        solve();
    }

    return 0;
}