import java.util.*;
public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int[]a = new int[n];
    
    for(int i=0; i<n; i++){
        a[i] = sc.nextInt();
}
    Arrays.sort(a); 

        System.out.print(a[n-1]-a[0]);
    }
}
