#include <bits/stdc++.h>
using namespace std;

int main() {
    int n, tp;
    bool f = true;
    vector<int> a;
    string ans ="No";

    cin >> n;
    for(int i=0; i<n; i++){
        cin >> tp;
        a.push_back(tp);
    }
    if (n<=2) ans ="Yes";
    
    else{
        int s = a.front() + a.back();
        int b = a.size() - 1;
        int j = n / 2;
        if (n % 2 != 0) j += 1;

        for(int i=1; i<j; i++){
            if(a[i] + a[b-i] != s) f = false;
        }
        if (f) ans ="Yes";
    }
    cout << ans << endl;
}