#include <bits/stdc++.h>   using namespace ::std;   int a[110], n, c, i, j, o, m;   int main() {     cin >> n >> c;     cin >> a[0];     for (i = 1; i < n; i++) {       cin >> a[i];       m = max(a[i - 1] - a[i] - c, m);     }     cout << m;   }   