#include <cstdio>
#include <iostream>
#include <algorithm>

using namespace std;

int a[105], n;

bool ans(int pos) {
    if (pos > n)
        return true;
    if (a[pos] == 1)
        return (!ans(pos + 1));
    return true;
}

int main() {
    freopen("smallnim.in", "r", stdin);
    freopen("smallnim.out", "w", stdout);

    cin >> n;
    for (int i = 0; i < n; i++)
        cin >> a[i];

    sort(a, a + n);

    if (ans(0))
        cout << "YES\n" << (a[0] - 1 > 0 ? a[0] - 1: 1);
    else
        cout << "NO\n";

    return 0;
}