#include <iostream>
#include <stdio.h>
#include <math.h>
#include <iomanip>
using namespace std;
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
int n , a , ans = 0;
int main()
{
	cin >> n;
	for( int i = 1 ; i <= n ; i++ )
	{
		cin >> a;
		if( ans < a )
		{
			ans = a;
		}
		else if( ans == a )
		{
			ans = a;
		}
	}
	cout << ans; 
    return 0;
}