import java.io.*;
class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int a = Integer.parseInt(reader.readLine());
int b = 0;
int sum = 0;
if (a > 0) {
do {
int c = Integer.parseInt(reader.readLine());
sum = Math.max(c, sum);
++b;
} while (b < a);
}
System.out.println(sum);
}
}
import java.io.*;
class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int a = Integer.parseInt(reader.readLine());
int b = 0;
int sum = 0;
if (a > 0) {
do {
int c = Integer.parseInt(reader.readLine());
sum = Math.max(c, sum);
++b;
} while (b < a);
}
System.out.println(sum);
}
}