public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int n = Integer.parseInt(reader.readLine());
if (n > 0) {
int[] arr1 = new int[n+1];
for (int i = 0; i < n; i++) {
arr1[i] = Integer.parseInt(reader.readLine());
}
Arrays.sort(arr1);
System.out.println(arr1[n]);
}//end_if
}// end_main
package com.javarush.task.task05.task0532;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.*;
import java.io.Reader;
import java.util.Arrays;
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());
if (n > 0) {
int[] arr1 = new int[n+1];
for (int i = 0; i < n; i++) {
arr1[i] = Integer.parseInt(reader.readLine());
}
Arrays.sort(arr1);
System.out.println(arr1[n]);
}//end if
}
}