pat1008

#include<cstdio>using namespace std;int main(){    int k;    while(scanf("%d",&k)!=EOF){        int floor,pre=0,sum=0;        for(int i=0;i<k;i++)        {            scanf("%d",&floor);            sum+=5;            if(floor>pre)                sum+=6*(floor-pre);            else sum+=4*(pre-floor);            pre=floor;        }        printf("%d\n",sum);    }    return 0;}