import java.util.*;

class Main{
	
	public static void main(String args[]){

		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int arr[] = new int[N];
		int min=-1,max=-1;
		for(int n=0;n<N;n++){
			arr[n] = sc.nextInt();
			if(min==-1){
				min = arr[n];
				max = arr[n];
			}
			if(min > arr[n]) min = arr[n];
			if(max < arr[n]) max = arr[n];
		}

		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