import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int size = sc.nextInt();
    int zero = sc.nextInt();
    int min = zero;
    int max = zero;
    for(int i = 1; i < size; i++){
      int a = sc.nextInt();
      if(a < min){
        min = a;
      }
      if(a > max){
        max = a;
      }
    }
    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