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

int main(){
    int N, K;
    cin >> N >> K;
    vector<int> v(N);
    for(int i=0;i<N;++i){
        cin >> v[i];
    }
    auto minmax_value = minmax_element(begin(v), end(v));
    cout << *minmax_value.second - *minmax_value.first << endl;

    return 0;
}