import sys
input = sys.stdin.readline

mod=998244353

FACT=[1]
for i in range(1,10**6+1):
    FACT.append(FACT[-1]*i%mod)

FACT_INV=[pow(FACT[-1],mod-2,mod)]
for i in range(10**6,0,-1):
    FACT_INV.append(FACT_INV[-1]*i%mod)

FACT_INV.reverse()

def Combi(a,b):
    if 0<=b<=a:
        return FACT[a]*FACT_INV[b]%mod*FACT_INV[a-b]%mod
    else:
        return 0


N=int(input())
S=input().strip()

if S[1]=="(":
    ANS=0

    x=N//2

    for i in range(x+1):
        ANS=(ANS+Combi(x,i)*Combi(x,i))%mod

    print(ANS)

else:
    x=N//2

    print(pow(2,x,mod))