#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <array>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;

    int r = 0, t = 0;
    for (int i = 0; i < n; i++) {
        int p;
        cin >> p;

        if (p < t) {
            r = max(r, p);
        }
        t = max(t, p);
    }

    cout << r << endl;

    return 0;
}