#include <bits/stdc++.h>   using namespace std;   int main() {     int n, d;     cin >> n >> d;     vector<int> a(n);     for (int i = 0; i < n; ++i) cin >> a[i];     int ans = 2;     for (int i = 1; i < n; ++i) {       if (a[i] - a[i - 1] > 2 * d)         ans += 2;       else if (a[i] - a[i - 1] == 2 * d)         ++ans;     }     cout << ans <<   n ;     return 0;   }   