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package com.javarush.task.task05.task0532;
import java.io.*;
/*
Задача по алгоритмам
*/
public class Solution {
public static void main(String[] args) throws Exception {
int maximum = 0;
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int N = Integer.parseInt(reader.readLine());
if(N>0){
for(int i=N;i>0;i--){
int a = Integer.parseInt(reader.readLine());
if(Math.abs(a)>=maximum)
maximum=a;
}
}
System.out.println(maximum);
}
}