use std::{collections::HashMap, io::Read};

fn main() {
	let mut s = String::new();
	std::io::stdin().read_to_string(&mut s).ok();
	let mut p = s.split_whitespace();
	let n: usize = p.next().unwrap().parse().unwrap();
	let mut h = HashMap::new();
	let mut i = 0;
	for p in p.rev() {
		i += 1;
		let c = h.entry(p).or_insert(0);
		if i < n {
			*h.entry(p).or_insert(0) += 1;
			continue;
		}
		*c -= 1;
		if *c < 0 {
			println!("{}", p);
			break;
		}
	}
}