import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String args[]) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String line = br.readLine();
		int n = Integer.parseInt(line);
		line = br.readLine();
//		int k = Integer.parseInt(line);
		int min = 1000;
		int max = 0;
		for (int i = 0; i < n; i++) {
			int t = Integer.parseInt(br.readLine());
			if (min > t) {
				min = t;
			}
			if (max < t) {
				max = t;
			}
		}
		
		System.out.println(max - min);
	}
}