// ConsoleApplication2.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include<math.h>
using namespace std;
int a[100000] = { 0 };
int main()
{
    int t,min=10000;
    cin >> t;
    for (int i = 0;i < t;i++) {
        cin >> a[i];
    }
    for (int i = 0;i < t;i++) {
        if (a[i] < min) {
            min = a[i];
        }
       
    }
    if (min >= 0) {
        cout << 0;
    }
    else {
        int out = abs(min);
        cout << out;
    }
}