// C++
#include <iostream>
using namespace std;
int main()
{
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int max = a[0];
    for (int j = 0; j < n; j++) {
        if (a[j] > max) {
            max = a[j];
        }
    }
    cout << max;
    return 0;
}

# Python
inp = input()
nums = [int (x) for x in inp.split()]
int max = nums[0];
for i in nums:
    if (i > max):
        max = i
print(max)