#include <bits/stdc++.h>
using namespace std;
#define ll long long
void solve()
{
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; ++i)
        cin >> a[i];
    if (n == 1)
    {
        cout << "Yes";
        return;
    }
    int t = a[0] + a[n - 1];
    bool f = 0;
    for (int i = 0; i < n / 2; ++i)
    {
        if (!(a[i] + a[n - 1 - i] == t))
        {
            f = 1;
        }
    }
    if (f)
        cout << "No";
    else
        cout << "Yes";
}

int main()
{
    int tc = 1;
    // cin >> tc;
    while (tc--)
    {
        solve();
    }
}