#include <iostream>
#include <algorithm>
using namespace std;



int main(){
    int e;
    bool kirk = false;
    cin >> e;

    int arr[e];
    for (int i = 0; i < e; i++)
    {
        cin >> arr[i];
    }

        if(e == 1){
        cout << "Yes" << endl;
        return 0;
    }
    int b = arr[0] + arr[e-1];
    int t =e;
    if(e%2==0)
        e=e/2;
    else
        e=e/2+1;

    for(int i = 0; i < e; i++){
        if(arr[i] + arr[t-i-1]== b)
            kirk = true;
        else{
            kirk = false;
            break;
        } 

    }
        if(kirk)
            cout << "Yes"<<endl;
        else
            cout << "No"<<endl;
    
    return 0;
}