hdoj1008

 #include<iostream>using namespace std;int main(){    int i,a,sum;    int n;    while( cin >> n)    {           i = 0;           sum = 0;           if(n==0)break;           while(n--)           {                     cin >> a;                     if(i < a)                     {                          sum += (a-i)*6;                          sum += 5;                          i = a;                          }                          else                           {                               sum += (i -a)*4;                               sum += 5;                               i = a;                               }                     }              cout << sum << endl;                  }    system("pause");    }