import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int max = 0 ;
while(sc.hasNextInt()) {
int score = sc.nextInt();
if(max < score) {
max = score;
}
}
System.out.println(max);
}
}