mod=998244353

n=int(input())
A=list(input().split())
B=list(input().split())

dp=[[[0]*(9) for _ in range(34+1)] for _ in range(4+1)]
dp[0][0][0]=1
ans=0
X=[]
for i in range(n):
  a,b=A[i],B[i]
  if "X" in b:
    X.append((int(a),int("0"+b[:-1])))
    continue
  a,b=int(a),int(b)
  for ai in range(4+1)[::-1]:
    for bi in range(33+1)[::-1]:
      for k in range(8)[::-1]:
        if 0<=ai-a and 0<=bi-b:
          dp[ai][bi][k+1]+=dp[ai-a][bi-b][k]
          dp[ai][bi][k+1]%=mod


for a,b in X:
  if 0<=4-a and 0<=33-b:
    if b!=0 and b<28:
      continue
    ans+=dp[4-a][33-b][8]
    ans%=mod
    
print(ans)