MOD = 998244353

S = input()
n = len(S)

dp = [[0] * 2 for _ in range(n)]
dp[0][0] = 1

for s in S:
    ndp = [[0] * 2 for _ in range(n)]
    def f1():
        for i in range(n - 1):
            ndp[i + 1][0] += dp[i][0]
            ndp[i + 1][1] += dp[i][1]
            ndp[i + 1][0] %= MOD
            ndp[i + 1][1] %= MOD

    def f2():
        for i in range(n - 1):
            ndp[i][0] += dp[i + 1][0]
            ndp[i][1] += dp[i + 1][1]
            ndp[i][0] %= MOD
            ndp[i][1] %= MOD

    def f3():
        for i in range(n - 1):
            ndp[i + 1][0] += dp[i][0]
            ndp[i + 1][0] %= MOD

            ndp[i][1] += dp[i + 1][1] + dp[i + 1][0]
            ndp[i][1] %= MOD


    if s == "(":
        f1()
    elif s == ")":
        f2()
    elif s == "?":
        f3()
    else:
        f1()
        f2()
        f3()
    
    dp = ndp


ans = dp[0][0] + dp[0][1]
print(ans % MOD)