use proconio::{input, fastout};

#[fastout]
fn main() {
	input! {
		n: usize,
		a: [u8; n],
	}
	
	println!("{}", output(solve(n, a)));
}

fn solve(n: usize, a: Vec<u8>) -> bool {
	for i in 0..n {
		if a[i] + a[(n - 1) - i] != a[0] + a[n - 1] {
			return false;
		}
	}
	true
}

fn output(ans: bool) -> &'static str {
	match ans {
		true => "Yes",
		false => "No",
	}
}