#include <bits/stdc++.h>
using namespace std;

signed main(){
  int N, K; cin >> N >> K;
  vector< int > A( N );
  for( int i = 0; i < N; ++i )
    cin >> A[ i ];
  cout << *max_element( A.begin(), A.end() ) - *min_element( A.begin(), A.end() ) << endl;
  return 0;
}