#include <iostream>
#include <sstream>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <iomanip>

using namespace std;
#define ll long long
void sherry()
{
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
#endif
}

ll n;
ll i = 0;
ll recursion(ll arr[], ll i)
{
    if (n == i)
        return 1;
    return arr[i] == arr[n - i - 1] && recursion(arr, i + 1);
}
int main()
{
    sherry();
    cin >> n;
    ll arr[n];
    for (int i = 0; i < n; i++)
        cin >> arr[i];
    recursion( arr, i) ? cout << "YES" : cout << "NO";
    return 0;
}