#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    int N, K;
    std::cin >> N >> K;
    std::vector<int> E;

    while (N--) {
        int a;
        std::cin >> a;
        E.push_back(a);
    }

    std::sort(E.begin(), E.end());

    std::cout << E.back() - E.front() << std::endl;

    return 0;
}