#include <bits/stdc++.h> using namespace std; //#include <atcoder/all> //using namespace atcoder; using ll=long long; using Graph=vector<vector<int>>; #define MAX 1000000 #define MOD 1000000007 //#define MOD 998244353 #define INF 1000000000 //#define INF 1000000000000000000 int main(){ int N,K; cin>>N>>K; vector<int> a(N); for(int i=0;i<N;i++){ cin>>a[i]; } sort(a.begin(),a.end()); cout<<a[N-1]-a[0]<<endl; }