#include <iostream>
using namespace std;

int main()
{
    int N,K,n[9];
    int max=0,min=1000;
    cin >> N >> K;
    for(int i = 0; i < N; i++){
        cin >> n[i];
        if(max < n[i])
            max = n[i];
        if(min >n[i])
            min = n[i];
    }
    cout << max-min << endl;
    return 0;
}