#include <iostream>
#include <algorithm>

using namespace std;

int main()
{
    int n, k, a[1000010];
    
    cin >> n >> k;
    
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    
    sort(a, a+n);
    
    cout << a[n-1] - a[0] << endl;
}