#include <iostream>
#include <string>

using namespace std;

int main()
{
	int n, max, num;
	while(cin >> n)
	{
		max = -2147483648;
		for(int i = 0; i < n; i++)
		{
			cin >> num;
			if(num > max)
			{
				max = num;
			}
		}
		cout << max << endl;
	}
        return 0;
}