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 = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
while(sc.hasNextInt()) {
int score = sc.nextInt();
if(max < score) {
max = score;
}
if(min > score) {
min = score;
}
}
System.out.println(max - min);
}
}