import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int[] values = new int[N+1];
        for (int i=1; i<=N; i++) {
            values[i] = sc.nextInt();
        }
        int min = 0;
        int Max = 0;
      
      for (int i=1; i<=N; i++) {
        if (min == 0 || values[i] < min) {
          min = values[i];
        }  
        
        if (Max == 0 || Max < values[i]) {
          Max = values[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