package com.codegym.task.task05.task0532;
import java.io.*;
/*
Task about algorithms
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int maximum = 0;
int N = Integer.parseInt(reader.readLine());
if(N>0){
int v[] = new int[N];
for(int a=0;a<N;a++){
v[a] = Integer.parseInt(reader.readLine());
}
for(int i=0;i<N;i++){
if(v[i] > maximum){
maximum = v[i];
}
}
System.out.println(maximum);
}
else{
System.out.println("please enter a positive value");
}
}
}