#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e9 + 10;
const ll INFL = 4e18;

int main() {
    int N;
    cin >> N;
    vector<ll> A(N);
    for (int i = 0; i < N; i++) cin >> A[i];

    ll sum = accumulate(A.begin(), A.end(), 0ll);
    ll mx = ranges::max(A);

    if (mx <= 2 && sum <= 2 * N - 1) {
        cout << "Yes" << endl;
    } else {
        cout << "No" << endl;
    }
}