func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAX = 1e6 + 6;   long long int arr[2000005], brr[2000005], crr[2000005];   void solve(int n, long long int arr[]) {     int cnt = n + arr[0];     for (int i = 1; i < n; i++) {       cnt += abs(arr[i] - arr[i - 1]) + 1;     }     cout << cnt;     return;   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int n;     cin >> n;     for (int i = 0; i < n; i++) cin >> arr[i];     solve(n, arr);     cout << endl;   }   