#include<stdio.h>
int main()
{
	int to,floor=0,up,down,time=0;
	while(scanf("%d",&to)!=EOF)
	{
		if(to-floor>0)//*上楼
		{
			up=to-floor;
			time+=6*up;//*上楼所花时间
		}
		else               //*下楼
		{
			down=floor-to;
			time+=4*down;//*下楼所花时间
		}
		time+=5;//*停留时间
	}
	printf("%d",time);
	return 0;
}
无输出