#include <iostream>
using namespace std;

int main(void){
	int N,K;
	double max = 0,min = 1000;
	cin >> N >> K;
	for(int v,i = 0;i < N;i++){
		cin >> v;
		min = min > v ? v : min;
		max = max < v ? v : max; 
	}
	cout << (int)(max - min + 0.9) << endl;
}