import java.util.*;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = Integer.parseInt(sc.next());
        long[] a = new long[N];
        a[0] = Long.parseLong(sc.next());
        long max = a[0];
        long min = a[0];
        for(int i=1; i<N; i++) {
            a[i] = Long.parseLong(sc.next());
            if(max < a[i]) max = a[i];
            if(min > a[i]) min = a[i];
        }
        System.out.println(max-min);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz