#include "iostream"
#include "climits"
#include "list"
#include "queue"
#include "stack"
#include "set"
#include "functional"
#include "algorithm"
#include "string"
#include "map"
#include "unordered_map"
#include "unordered_set"
#include "iomanip"
#include "cmath"
#include "random"
#include "bitset"
#include "cstdio"
#include "numeric"
#include "cassert"
#include "ctime"

using namespace std;

//constexpr long long int MOD = 1000000007;
constexpr long long int MOD = 998244353;
constexpr double EPS = 1e-8;

//int N, M, K, T, H, W, L, R;
long long int N, M, K, T, H, W, L, R;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	cin >> N;
	vector<long long>dp(N + 1);
	string s;
	cin >> s;
	dp[0] = 1;
	int c = 0;
	for (auto i : s) {
		vector<long long>nx(N + 1);
		int add = 1;
		if (i == ')')add = -1;
		c += add;
		for (int j = 0; j <= N; j++) {
			{
				int k = j + add;
				if (0 <= k && k <= c) {
					nx[k] += dp[j];
					nx[k] %= MOD;
				}
			}
			{
				int k = j;
				if (0 <= k && k <= c) {
					nx[k] += dp[j];
					nx[k] %= MOD;
				}
			}
		}
		dp = nx;
	}
	cout << dp[0] << endl;
}