import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        
        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.println(a[N - 1] - a[0]);
    }
}
