#include <bits/stdc++.h>
using namespace std;
int main(int argc, char** argv) {
  long int a;
  while (cin >> a) {
    unsigned long int b, c=0;
    for (long int i=0;i<a;i++) {
      cin >> b;
      if (b>c) c=b;
    }
    cout << c << endl;
  }
}