#include <bits/stdc++.h>
using namespace std;
//#pragma GCC optimize ("-O3")
using ll = long long;

#define ALL(obj) (obj).begin(),(obj).end()
#define PRINT(n) cout << n << "\n";

// REP(i,n)   -- 0 - n-1 ++
#define REP(i,n)  for(int i=0;i<(int)n;++i)

void no21();
int main() {cin.tie(0); ios::sync_with_stdio(false); no21();}

/********************************/
/** yukicoder No.21            **/
/** by MoonlightSonata         **/
/********************************/


void no21(){
    int n, k;
    cin >> n >> k;
    vector<int> s(n, 0);
    REP(i,n) cin >> s[i];
    sort(ALL(s));
    PRINT(s[n-1] - s[0])
}