#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    int n, k;
    cin >> n >> k;

    int ma = 0;
    int mi = 1001001001;
    rep(i,n){
        int a; cin >> a;
        ma = max(ma, a);
        mi = min(mi, a);
    }

    int ans = ma- mi;

    cout << ans << endl;
    return 0;
}