zoj 2108 Elevator

//连着几次按同一层也要每次消耗在每一层楼停的5秒钟

#include<stdio.h>

int main(){
	int n,sec,flr,now;
	while(scanf("%d",&n)&&n){
		sec = 0;
		now = 0;
		while(n--){
			scanf("%d",&flr);
			if(flr - now > 0) sec += (flr - now)*6 + 5;
			if(flr - now < 0) sec += (now - flr)*4 + 5;
			if(flr == now) sec += 5;
			now = flr;
		}
		printf("%d\n",sec);
	}
return 0;
	}