ZJU PAT 1008

 http://pat.zju.edu.cn/contests/pat-practise/1008

#include <stdio.h>
int number[102];
int main()
{
        int N;
        scanf("%d",&N);
        int i;
        for(i=0;i<N;i++)
                scanf("%d",&number[i]);
        int sum=0;
        sum+=6*number[0];
        for(i=1;i<N;i++){
                if(number[i]>number[i-1])
                        sum+=6*(number[i]-number[i-1]);
                else sum+=4*(number[i-1]-number[i]);
        }
        printf("%d\n",sum+5*N);
}