#include <stdio.h>

void main(void){
	//グループの数
	int n = 0;
	int input = scanf("%d\n",&n);
	
	int k = 0;
	input = scanf("%d\n",&k);
	
	int numList[n];
	
	for(int i = 0 ; i < n ; i++ ){
		input = scanf("%d",&numList[i]);
	}
	
	for(int i = 0 ; i < n ; i++ ){
		for(int j = 0 ; j < n ; j++ ){
			if(numList[i] < numList[j]){
				int num = numList[i];
				numList[i] = numList[j];
				numList[j] = num;
			}
		}
	}
	
	printf("%d\n",numList[n-1]-numList[0]);
}