#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int,int>;
#define rep(i,n) for(int i=0;i<n;i++)

const ll mod = ll(1e9) + 7;
const int INF = 1<<29;

int main(){
    int n,k;
    cin >> n >> k;
    vector<int> a(n);
    rep(i,n) cin >> a[i];
    int a_max = 0,a_min = 1001;
    rep(i,n){
        a_max = max(a_max,a[i]);
        a_min = min(a_min,a[i]);
    }
    cout << a_max - a_min << endl;
    return 0;
}