#include "bits/stdc++.h"
using namespace std;

#define REP(i, n) for(ll i = 0;i < n;i++)
#define REPR(i, n) for(ll i = n;i >= 0;i--)
#define FOR(i, m, n) for(ll i = m;i < n;i++)
#define FORR(i, m, n) for(ll i = m;i >= n;i--)
#define REPO(i, n) for(ll i = 1;i <= n;i++)
#define ll long long
#define INF (ll)1ll << 60
#define MINF (-1 * INF)
#define ALL(n) n.begin(),n.end()
#define MOD (ll)1000000007
#define P pair<ll, ll>

ll mod = 998244353;
ll powmod(ll a, ll b, ll mod = 1e9+7) {
	a %= mod;
	ll res = 1;
	while (b > 0) {
		if (b % 2 == 1)res = res * a % mod;
		a = a * a % mod;
		b /= 2;
	}
	return res;
}

int main(){
    ll n, cnt = 0;
    cin >> n;
    REP(i, n){
        ll a;
        cin >> a;
        if(a)cnt++;
    }
    cout << min(cnt, n - cnt) * powmod(n, mod - 2, mod) % mod << endl;
}