#include<iostream> #include<string> #include<vector> #include<set> #include<algorithm> #include<queue> #include<functional> #define ll long long #define PLL pair<ll,ll> #define VS vector<string> #define VL vector<ll> #define rep(i,a) for (ll i=0;i<a;i++) #define nrep(i,n,a) for (ll i=n;i<a;i++) #define INF 1145141919810 #define VMIN(vec) *std::max_element(vec.begin(),vec.end()) #define VMIN(vec) *std::max_element(vec.begin(),vec.end()) #define TS(n) to_string(n) using namespace std; int main() { ll N, K,one,two,three; cin >> N >> K; VL vec(N); rep(i, N) cin >> vec[i]; sort(vec.begin(), vec.end()); cout << vec[N - 1] - vec[0] << endl; return 0; }