#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    
    int s = INT_MAX,b = 0;
    int N,K;
    cin >> N >> K;
    for ( int i = 0; i < N; i++ ) {
        int a;
        cin >> a;
        s = min( s, a );
        b = max( b, a );
    }
    
    cout << b - s << endl;
    
    return 0;
}