#include<iostream>
using namespace std;

int main() {
int n;
while(cin >> n) {
int c = 0;
int maxc = 0;
for (int i = 0; i < n; i++) {
cin >> c;
if (c > maxc) {
maxc = c;
}
}
cout << maxc << endl;
}
return 0;
}