hdu1008

#include<stdio.h>int main(){int n,floor,temp,sum;int up=6,down=4,stop=5;while(scanf("%d",&n),n){temp=sum=0;while(n--){scanf("%d",&floor);if(floor>temp){sum=sum+(floor-temp)*6+5;}else{sum=sum+(temp-floor)*4+5;}temp=floor;}printf("%d\n",sum);}return 0;}