import java.util.*;

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.println(a[n-1] - a[0]);
}
}
