#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
using namespace std;
int main(){
    int N,K,x;
    vector<int> n;
    cin >> N >> K;
    while(N--){
        cin >> x;
        n.push_back(x);
    }
    sort(n.begin(),n.end());
    cout << n[n.size()-1]-n[0];
    return 0;
}