#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define repl(i,a,b) for(ll i=(a);i<(b);i++)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()

template <typename T> bool chmin(T &a,T b){if(a>b){a=b;return true;} return false;}
template <typename T> bool chmax(T &a,T b){if(a<b){a=b;return true;} return false;}


void solve(){
  int n; cin >> n;
  vector<int> a(n);
  int minus=0,plus=0;
  rep(i,0,n){
    cin >> a[i];
    if(a[i]<0)minus++;
    if(a[i]>0)plus++;
  }
  using mint=modint998244353;
  if(minus == 0 && plus == 0){
    cout << "0\n";
    return;
  }
  if(minus == 0 || plus == 0){
    if(minus == 0) swap(minus,plus);
    mint ans=mint(2).pow(minus-1);
    if(n != minus) ans*=2;
    cout << ans.val() << "\n";
    return;
  }
  mint ans=mint(2).pow(minus-1)*mint(2).pow(plus-1);
  ans*=2;
  if(minus+plus != n)ans*=3;
  cout << ans.val() << "\n";
  return;
}
  
int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int T=1;
  // cin >> T;
  while(T--) solve();
}