import java.util.Scanner;
public class Main {
	public static void main(String[] args){
		Scanner in = new java.util.Scanner(System.in);
		int N = in.nextInt();
		int A;
		int min = Integer.MAX_VALUE;
		int max = 0;
		for(int i=0; i<N; i++) {
			A = in.nextInt();
			if(min > A) {
				min = A;
			}
			if(max < A) {
				max = A;
			}
		}
		
		System.out.println(max - min);
		in.close();
		
	}
}
/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