#include <iostream>
#include <climits>

using namespace std;

int Read() {
    int x;
    cin >> x;
    return x;
}

void maxSelf(int &x, int y) {
    if(y > x) {
        x = y;
    }
}

int n = Read(), a, mx = INT_MIN;

int main()
{
    if(n == 0) {
        cout << mx << '\n';
        return 0;
    } else {
        n--;
        a = Read();
        maxSelf(mx, a);
        return main();
    }
}