import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int N = Integer.parseInt(reader.readLine());
int maximum = N;
for (int i = 0; i < N; i++) {
int num = Integer.parseInt(reader.readLine());
if (num > maximum && num >= 0) {
maximum = num;
}
else if (num < maximum && num < 0){
maximum = num;
}
}
System.out.println(maximum);
}
}
package com.javarush.task.task05.task0532;
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int N = Integer.parseInt(reader.readLine());
int maximum = N;
for (int i = 0; i < N; i++) {
int num = Integer.parseInt(reader.readLine());
if (num > maximum && num >= 0) {
maximum = num;
}
else if (num < maximum && num < 0){
maximum = num;
}
}
System.out.println(maximum);
}
}