#include <bits/stdc++.h>

using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int> A(N), B;
    for (int i = 0; i < N; i++) {
        cin >> A[i];
    }
    B = A;
    reverse(B.begin(), B.end());
    bool ok = true;
    for (int i = 1; i < N; i++) {
        ok &= A[i] + B[i] == A[0] + B[0];
    }
    cout << (ok ? "Yes" : "No") << endl;
    return 0;
}