#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + 50;
int n, a[maxn], ans, maxx = 0;
int main() {
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
    maxx = max(maxx, a[i]);
  }
  cout << maxx;
  return 0;
}
