#include <stdio.h>
#include <malloc.h>
char str[60000];
int str_len = 0;

/// <summary>
/// 入力された数字を返す
/// </summary>
/// <returns></returns>
int ReadNum() {
	int negate = 0;
	char c = getchar();
	int num = 0;
	int numCnt = 0;
	while (c != '\n') {
		if (c == '-') {
			negate = 1;
		}
		else {
			num = num * 10 + c - '0';
		}

		c = getchar();
	}
	if (negate == 1) {
		num *= -1;
	}
	return num;
}

/// <summary>
/// 引数numsの中の値を昇順にソートする
/// </summary>
/// <param name="nums">ソートしたい配列</param>
/// <param name="n">ソートしたい配列の要素数</param>
void Sort(int* nums, int n) {
	for (int i = 0;i < n - 1;i++) {
		for (int j = i + 1;j < n;j++) {
			if (nums[i] < nums[j]) {
				int work = nums[i];
				nums[i] = nums[j];
				nums[j] = work;
			}
		}
	}
}


int main()
{
	int n = ReadNum();
	int k = ReadNum();
	int* nums;
	nums = (int*)malloc(sizeof(int) * n);
	for (int i = 0;i < n;i++) {
		nums[i] = ReadNum();
	}
	Sort(nums,n);

	printf("%d\n", nums[0] - nums[n-1]);
}