#include <iostream>

int main() {
    int n; std::cin >> n;
    int k; std::cin >> k;
    int maxN = 0;
    int minN = 1001;
    for(int i = 0; i < n; i++) {
        int t; std::cin >> t;
        maxN = std::max(maxN, t);
        minN = std::min(minN, t);
    }
    std::cout << maxN - minN << std::endl;
}