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#include <chrono>
#include <thread>
#include <iostream>
#include <string>
#include <stdlib.h>
using namespace std;
void foo();

int main()
{
	int n;
	cin >> n;
	int t;
	int max = 0;
	for (int i = 0; i < n; i++) {
		cin >> t;
		if (t > max) {
			max = t;
		}
	}
	cout << max;
	return 0;
}