#include <iostream>
#include <cmath>
using namespace std;

int main() {
    int N, K;
    cin >> N >> K;
    int ma = 0, mi = 100000;
    for(int i=0; i<N; ++i) {
        int n;
        cin >> n;
        ma = max(ma, n);
        mi = min(mi, n);
    }
    cout << ma - mi << endl;
}