// http://yukicoder.me/problems/67 #include <cstdlib> #include <algorithm> #include <iostream> #include <vector> int main() { std::cin.tie(0); std::ios::sync_with_stdio(false); int n, k; std::cin >> n >> k; std::vector<int> points(n); for (int i = 0; i < n; i++) { std::cin >> points[i]; } std::sort(points.begin(), points.end()); std::cout << (points[n - 1] - points[0]) << std::endl; return EXIT_SUCCESS; }