use proconio::input;
fn main(){
    input!{
        n:usize,
        a:[usize;n],
    }
    let mut ans="Yes";
    for i in (0..n){
        if a[0]+a[n-1]!=a[i]+a[n-1-i]{
            ans="No";
        }
    }
    print!("{}",ans);
}