#include <cstdio>
#include <algorithm>
#include <vector>

int main() {
  size_t n, k;
  scanf("%zu %zu", &n, &k);

  std::vector<int> a(n);
  for (auto& ai: a) scanf("%d", &ai);

  auto [it0, it1] = std::minmax_element(a.begin(), a.end());
  printf("%d\n", *it1-*it0);
}