use proconio::input;

fn main(){
    input!{
        n: usize,
        a: [i32; n],
    }

    let mut ok: bool = true;
    for i in 0..n{
        if a[0]+a[n-1] != a[i]+a[n-1-i]{
            ok = false;
        }
    }
    println!("{}", if ok{"Yes"} else{"No"});
}