杭电oj1008电梯

#include<iostream>

using namespace std;

int main()

{

 int n;

 while (cin >> n)

 {

  int a[101], i, j, sum = 0, b;

  if (n == 0)

   break;

  else

   cin >> b;

  sum += b * 6 + 5;

  for (i = 1; i < n; i++)

  {

   cin >> a[i];

   if (b < a[i])

    sum += (a[i] - b) * 6 + 5;

   if (b >= a[i])

    sum += (b - a[i]) * 4 + 5;

   b = a[i];

  }

  cout << sum << endl;

 }

 return 0;

}