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

int main(){
    int N,K,k; cin >> N >> K;
    int mx = 0, mn = 100000;
    rep(i,0,N){
        cin >> k;
        mx = max(mx,k);
        mn = min(mn,k);
    }
    cout << mx - mn << endl;
}