gistfile1.java

import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author wannabe
 */
public class Main {

	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Taller solver = new Taller();
		solver.solve(1, in, out);
		out.close();
	}

	static class Taller {

		public void solve(int testNumber, Scanner in, PrintWriter out) {
			int n = in.nextInt();
			int[] days = new int[n];
			for (int i = 0; i < n; i++) {
				days[i] = in.nextInt();
			}
			if (days.length == 1) {
				out.println(days[0]);
				return;
			}
			int max = Math.max(days[0], days[days.length - 1]);
			int min = Math.min(days[0], days[days.length - 1]);
			for (int i = 0; i < n; i++) {
				if (days[i] < min) {
					min = days[i];
				} else {
					if (days[i] > max) {
						max = days[i];
					}
				}
			}
			out.println(max - min);
		}

	}
}