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

int main() {
    int N, K;
    std::cin >> N;
    std::cin >> K;
    std::vector<int> V(N);
    for (int i = 0; i < N; i++) { std::cin >> V.at(i); }
    int max = *max_element(V.begin(), V.end());
    int min = *min_element(V.begin(), V.end());
    std::cout << max - min << std::endl;
}