
import java.util.Scanner;
public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int N = sc.nextInt();
		int[] A=new int[N];
		for(int i=0; i<N; i++) {A[i]=0;}
		for(int i=0; i<N; i++) {A[i]=sc.nextInt();}
		int max=0,min=-1;
		for(int i=0; i<N; i++) {
			if(A[i]>max)max=A[i];
			if(min==-1||A[i]<min)min=A[i];
		}
		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