#include <bits/stdc++.h>   using namespace std;   int a[100001], n;   int main() {     int i, h;     scanf( %d n , &n);     for (i = 1; i <= n; ++i) scanf( %d n , &a[i]);     h = a[1];     for (i = 2; i <= n; ++i)       if (a[i - 1] < a[i])         h += a[i] - a[i - 1] + 1;       else         h += a[i - 1] - a[i] + 1;     h += n;     printf( %d , h);     return 0;   }   