#include <iostream> #include <vector> #include <algorithm> #include <string> #include <sstream> #include <cstring> #include <cstdio> #include <cstdlib> #include <cmath> #include <queue> #include <stack> #include <map> #include <set> #include <numeric> #include <cctype> #include <tuple> #include <climits> #include <bitset> #include <cassert> #include <random> #ifdef _MSC_VER #include <agents.h> #endif #define FOR(i, a, b) for(int i = (a); i < (int)(b); ++i) #define rep(i, n) FOR(i, 0, n) #define ALL(v) v.begin(), v.end() #define REV(v) v.rbegin(), v.rend() #define MEMSET(v, s) memset(v, s, sizeof(v)) #define UNIQUE(v) (v).erase(unique(ALL(v)), (v).end()) #define MP make_pair #define MT make_tuple using namespace std; typedef long long ll; typedef pair<int, int> P; int main(){ cin.tie(0); ios::sync_with_stdio(false); int n, k; cin >> n >> k; vector<int> a(n); rep(i, n) cin >> a[i]; cout << *max_element(ALL(a)) - *min_element(ALL(a)) << endl; return 0; }