// yukicoder My Practice
// author: Leonardone @ NEETSDKASU
use std::io;

fn get_line() -> String {
	let mut input = String::new();
	io::stdin().read_line(&mut input).ok().expect("");
	return String::from(input.trim());
}

fn get_words() -> Vec<String> {
	get_line()
		.split_whitespace()
		.map(String::from)
		.collect()
}

fn get_integers() -> Vec<i32> {
	get_line()
		.split_whitespace()
		.map(|x| String::from(x).parse::<i32>().unwrap())
		.collect()
}

fn main() {
	
	let _ = get_line();
	let nums = get_integers();
	
	let (ans, _)  = nums
		.iter()
		.fold((0,0), |(ans, mx), &x| 
			if x > mx { (ans, x) }
			else { if ans < x  { (x, mx) } else { (ans, mx) } }
			);
	
	println!("{}", ans);
}