#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> nums(n+1);
    for (int i=1; i<=n; i++) {
        cin >> nums[i];
    }
    int a = nums[1] + nums[n];
    bool check = false;
    for (int i=1; i<=(n+1)/2; i++) {
        if ((nums[i] + nums[n-i+1]) != a) {
            check = true;
            break;
        }
    }

    if (check) {
        cout << "No" << endl;
    } else {
        cout << "Yes" << endl;
    }

    return 0;
}