#include <iostream>
#include <vector>

using namespace std;
typedef long long ll;
typedef string str;

#define MOD 998244353

int main() {
  ll N;
  cin >> N;

  vector<ll> A(N), B(N);
  for(ll i=0; i<N; i++){
    cin >> A[i];
    
    str temp;
    cin >> temp;
    
    if(temp == "X")
      B[i] = -1;
    else if(temp.back() == 'X')
      B[i] = -2;
    else
      B[i] = stoll(temp);
  }

  ll table[8][5][34];
  for(ll k=0; k<8; k++){
    for(ll a=0; a<5; a++){
      for(ll b=0; b<34; b++){
        table[k][a][b] = 0;
      }
    }
  }

  for(ll i=0; i<N; i++){
    if(B[i] < 0) continue;
    for(ll k=7; k>0; k--){
      for(ll a=A[i]; a<5; a++){
        for(ll b=B[i]; b<34; b++){
          table[k][a][b] = (table[k][a][b]+table[k-1][a-A[i]][b-B[i]])%MOD;
        }
      }
    }
    table[0][A[i]][B[i]]++;
  }
  
  ll ans = 0;

  for(ll i=0; i<N; i++){
    if(B[i] == -1)
      ans = (ans+table[7][4-A[i]][33])%MOD;
  }

  cout << ans << endl;
  return 0;
}