import java.util.Scanner;

class Ideone {

  public static void main(String args[]) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int c = 5526;
    int inp;
    for (int a = 0; a < n; a++) {
      inp = sc.nextInt();
      if (Math.abs(inp) < Math.abs(c)) {
        c = inp;
      }
    }
    System.out.print(c);
  }
}